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The reporting person undertakes to provide to SIGA Technologies, Inc., any security holder of SIGA Technologies, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4."}],"balance_after":228564,"source":{"system":"sec-edgar","filing":"0001140361-18-043004","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118043004/form4.xml","form_type":"4"}},{"id":3817351,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Restricted Stock 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of such options vesting on March 5, 2010, the second 1/3 of such options vesting on March 5, 2011, and the remaining 1/3 of such options vesting on March 5, 2012."}],"balance_after":0,"derivative":{"exercise_price":4.7,"expiration_date":"2019-03-05","underlying":"Common Stock, par value $.0001 per share","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":3817349,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Stock-Settled Stock Appreciation 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June 8, 2017 and the consequent issuance of common stock of the Issuer, and the related surrender to the Issuer of 12,175 shares of common stock of the Issuer by the Reporting Person in order to satisfy certain tax withholding obligations of the Issuer associated with the vesting of RSUs and the consequent issuance of common stock of the Issuer. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction. Each RSU converts into one share of common stock of the Issuer on a one for one basis."}],"balance_after":247465,"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":3817347,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2018-09-13T23:32:09.000Z","date":"2018-09-11","kind":"exercise","acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F6","text":"This Form 4 reports the vesting of 25,000 restricted stock units (\"RSUs\") granted on June 8, 2017 and the consequent issuance of common stock of the Issuer, and the related surrender to the Issuer of 12,175 shares of common stock of the Issuer by the Reporting Person in order to satisfy certain tax withholding obligations of the Issuer associated with the vesting of RSUs and the consequent issuance of common stock of the Issuer. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction. Each RSU converts into one share of common stock of the Issuer on a one for one basis."}],"balance_after":259640,"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":3817346,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2018-09-13T23:32:09.000Z","date":"2018-09-11","kind":"tax_withholding","acquired":false,"shares":32821,"price":7.16,"value":234998.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"This Form 4 reports the exercise of options for 50,000 shares of common stock of the Issuer granted on March 5, 2009 and the related surrender to the Issuer of 32,821 shares of common stock of the Issuer by the Reporting Person in order to effect the option exercise. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction."}],"balance_after":234640,"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":3817345,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2018-09-13T23:32:09.000Z","date":"2018-09-11","kind":"exercise","acquired":true,"shares":50000,"price":4.7,"value":235000.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"This Form 4 reports the exercise of options for 50,000 shares of common stock of the Issuer granted on March 5, 2009 and the related surrender to the Issuer of 32,821 shares of common stock of the Issuer by the Reporting Person in order to effect the option exercise. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction."}],"balance_after":267461,"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":3817344,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2018-09-13T23:32:09.000Z","date":"2018-09-11","kind":"tax_withholding","acquired":false,"shares":8853,"price":7.16,"value":63387.48,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 4 reports the exercise of 37,500 stock-settled appreciation rights (\"SSARs\") for shares of common stock of SIGA Technologies, Inc. (the \"Issuer\") granted on February 12, 2012 and the related surrender to the Issuer of 8,853 shares of common stock of the Issuer by the Reporting Person in order to satisfy certain tax withholding obligations of the Issuer associated with the exercise of SSARs and the consequent issuance of common stock of the Issuer. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction."},{"field":"shares","element":"transactionShares","label":"F2","text":"Each SSAR consists of the right to receive an amount, in common stock, equal to the excess of the fair market value of a share of common stock of the Issuer (subject to a cap on the fair market value at $7.00 per share) on the date of exercise over the exercise price of such SSAR. The number of shares of common stock issued was determined by dividing the total of all exercised SSARs by the fair market value of a share of common stock of the Issuer on the date of exercise."}],"balance_after":217461,"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":3817343,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2018-09-13T23:32:09.000Z","date":"2018-09-11","kind":"exercise","acquired":true,"shares":18174,"price":3.53,"value":64154.22,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 4 reports the exercise of 37,500 stock-settled appreciation rights (\"SSARs\") for shares of common stock of SIGA Technologies, Inc. (the \"Issuer\") granted on February 12, 2012 and the related surrender to the Issuer of 8,853 shares of common stock of the Issuer by the Reporting Person in order to satisfy certain tax withholding obligations of the Issuer associated with the exercise of SSARs and the consequent issuance of common stock of the Issuer. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction."},{"field":"shares","element":"transactionShares","label":"F2","text":"Each SSAR consists of the right to receive an amount, in common stock, equal to the excess of the fair market value of a share of common stock of the Issuer (subject to a cap on the fair market value at $7.00 per share) on the date of exercise over the exercise price of such SSAR. The number of shares of common stock issued was determined by dividing the total of all exercised SSARs by the fair market value of a share of common stock of the Issuer on the date of exercise."}],"balance_after":226314,"source":{"system":"sec-edgar","filing":"0001140361-18-038417","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036118038417/form4.xml","form_type":"4"}},{"id":4164143,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Stock-Settled Stock Appreciation Rights","published_at":"2017-11-14T22:11:24.000Z","date":"2017-11-10","kind":"exercise","acquired":false,"shares":337500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The SSARs vested in equal yearly installments over a period of three (3) years, with the first 1/3 of such SSARs vesting on February 2, 2013, the second 1/3 of such SSARs vesting on February 2, 2014, and the remaining 1/3 of such SSARs vesting on February 2, 2015."}],"balance_after":0,"derivative":{"exercise_price":3.53,"expiration_date":"2019-02-03","underlying":"Common Stock, par value $.0001 per share","underlying_shares":337500},"source":{"system":"sec-edgar","filing":"0001140361-17-042876","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117042876/form4.xml","form_type":"4"}},{"id":4164142,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2017-11-14T22:11:24.000Z","date":"2017-11-10","kind":"tax_withholding","acquired":false,"shares":29439,"price":4.6,"value":135419.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"The Issuer has certain tax withholding obligations associated with the exercise of SSARs and the consequent issuance of common stock of the Issuer.  This Form 4 reports the surrender to the Issuer by the Reporting Person of 29,439 shares of common stock otherwise issuable upon the exercise of the SSARs in order to satisfy those withholding tax obligations."}],"balance_after":208140,"source":{"system":"sec-edgar","filing":"0001140361-17-042876","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117042876/form4.xml","form_type":"4"}},{"id":4164141,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2017-11-14T22:11:24.000Z","date":"2017-11-10","kind":"exercise","acquired":true,"shares":71168,"price":3.53,"value":251223.04,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 4 reports the exercise of 337,500 stock-settled appreciation rights (\"SSARs\") for shares of common stock of SIGA Technologies, Inc. (the \"Issuer\"). Each SSAR consists of the right to receive an amount (the \"Excess Amount\"), in common stock, equal to the excess of the fair market value of one share of common stock of the Issuer (subject to a cap on the fair market value at $4.50 per share) on the date of exercise over the exercise price of such SSAR.  The number of shares of common stock issued was determined by dividing the total of all exercised SSARs by the fair market value of one share of common stock of the Issuer on the date of exercise."}],"balance_after":237579,"source":{"system":"sec-edgar","filing":"0001140361-17-042876","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117042876/form4.xml","form_type":"4"}},{"id":4286156,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Restricted Stock Units","published_at":"2017-06-12T20:15:46.000Z","date":"2017-06-08","kind":"grant","acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each restricted stock unit (\"RSU\") converts into one share of common stock of the Issuer on a one for one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs vest upon the U.S. Food & Drug Administration's final approval of TPOXX for the treatment of orthopoxvirus infections."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs vest upon the U.S. Food & Drug Administration's final approval of TPOXX for the treatment of orthopoxvirus infections."}],"balance_after":25000,"derivative":{"underlying":"Common Stock, par value $.0001 per share","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001140361-17-024679","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117024679/form4.xml","form_type":"4"}},{"id":4286155,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Stock Option (Right to buy)","published_at":"2017-06-12T20:15:46.000Z","date":"2017-06-08","kind":"disposition_to_issuer","acquired":false,"shares":200000,"price":0.42,"value":84000.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The 200,000 vested options were cash settled by mutual agreement of the reporting person and the Issuer. The reporting person received $84,000 as consideration for the surrender and cancellation of the vested options."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Options to purchase up to 300,000 shares of common stock of SIGA Technologies, Inc. (the \"Issuer\") were granted to the reporting person pursuant to a Stock Option Agreement, dated July 26, 2007, of which options to purchase 200,000 of such shares have vested."}],"balance_after":100000,"derivative":{"exercise_price":3.1,"expiration_date":"2017-07-26","underlying":"Common Stock, par value $.0001 per share","underlying_shares":200000},"source":{"system":"sec-edgar","filing":"0001140361-17-024679","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117024679/form4.xml","form_type":"4"}},{"id":4499663,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Restricted Stock Units","published_at":"2017-01-06T01:12:58.000Z","date":"2017-01-03","kind":"exercise","acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2014. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2014. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2014. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $.0001 per share","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001140361-17-000866","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117000866/form4.xml","form_type":"4"}},{"id":4499662,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2017-01-06T01:12:58.000Z","date":"2017-01-03","kind":"tax_withholding","acquired":false,"shares":10413,"price":2.93,"value":30510.09,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"SIGA Technologies, Inc. (the \"Issuer\") has certain tax withholding obligations associated with the vesting of restricted stock units (\"RSUs\") and the consequent issuance of Common Stock of the Issuer. This Form 4 reports the surrender to the Issuer by the Reporting Person of 10,413  shares of Common Stock -- granted in the form of RSUs on January 3, 2014 -- in order to satisfy those withholding tax obligations."}],"balance_after":166411,"source":{"system":"sec-edgar","filing":"0001140361-17-000866","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117000866/form4.xml","form_type":"4"}},{"id":4499661,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2017-01-06T01:12:58.000Z","date":"2017-01-03","kind":"exercise","acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":176824,"source":{"system":"sec-edgar","filing":"0001140361-17-000866","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036117000866/form4.xml","form_type":"4"}},{"id":4525845,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Restricted Stock Units","published_at":"2016-12-12T22:35:48.000Z","date":"2016-12-08","kind":"exercise","acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2014.  Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2014.  Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2014.  Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."}],"balance_after":25000,"derivative":{"underlying":"Common Stock, par value $.0001 per share","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001140361-16-089413","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089413/form4.xml","form_type":"4"}},{"id":4525844,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Restricted Stock Units","published_at":"2016-12-12T22:35:48.000Z","date":"2016-12-08","kind":"exercise","acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2013.  Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2013.  Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Represents vesting and conversion of certain RSUs granted on January 3, 2013.  Each RSU converts into one share of Common Stock of the Issuer on a one for one basis."}],"balance_after":0,"derivative":{"underlying":"Common Stock, par value $.0001 per share","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001140361-16-089413","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089413/form4.xml","form_type":"4"}},{"id":4525843,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2016-12-12T22:35:48.000Z","date":"2016-12-08","kind":"tax_withholding","acquired":false,"shares":20300,"price":3.13,"value":63539.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"SIGA Technologies, Inc. (the \"Issuer\") has certain tax withholding obligations associated with the vesting of restricted stock units (\"RSUs\") and the consequent issuance of Common Stock of the Issuer. This Form 4 reports the surrender to the Issuer by the Reporting Person of 20,300 shares of Common Stock -- granted in the form of RSUs on January 3, 2013 and January 3, 2014 -- in order to satisfy those withholding tax obligations."}],"balance_after":151824,"source":{"system":"sec-edgar","filing":"0001140361-16-089413","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089413/form4.xml","form_type":"4"}},{"id":4525842,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2016-12-12T22:35:48.000Z","date":"2016-12-08","kind":"exercise","acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":172124,"source":{"system":"sec-edgar","filing":"0001140361-16-089413","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089413/form4.xml","form_type":"4"}},{"id":4525841,"issuer":{"id":6205,"kind":"organization","name":"SIGA TECHNOLOGIES INC"},"owners":[{"id":60224,"kind":"person","name":"Hruby Dennis E","position":1,"cik":"0001301548","reported_name":"Hruby Dennis E","relationship":{"officer":true,"officer_title":"VP & Chief Scientific Officer"}}],"security":"Common Stock, par value $.0001 per share","published_at":"2016-12-12T22:35:48.000Z","date":"2016-12-08","kind":"exercise","acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":147124,"source":{"system":"sec-edgar","filing":"0001140361-16-089413","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1010086/000114036116089413/form4.xml","form_type":"4"}}]}