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The reporting person undertakes to provide to any security holder of the Issuer 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 to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Excludes 5,471 Restricted Stock Units payable in shares of the Issuer's common stock that have not vested as of the date of this Report."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001140361-16-082360","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1532558/000114036116082360/form4.xml","form_type":"4"}},{"id":4581343,"issuer":{"id":159180,"kind":"organization","name":"Asterias Biotherapeutics, Inc.","symbol":"NONE"},"owners":[{"id":158917,"kind":"person","name":"Wirth Edward","position":1,"cik":"0001532558","reported_name":"Wirth Edward","relationship":{"officer":true,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2016-10-11T07:01:21.000Z","date":"2016-10-06","kind":"tax_withholding","acquired":false,"shares":2055,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Securities withheld for tax purposes exempt under Rule 16(b)-3 in connection with the vesting of 5,470 Restricted Stock Units, the grant of which was previously reported on a Form 4"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Excludes 5,471 Restricted Stock Units payable in shares of the Issuer's common stock that have not vested as of the date of this Report."}],"balance_after":3415,"source":{"system":"sec-edgar","filing":"0001140361-16-082360","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1532558/000114036116082360/form4.xml","form_type":"4"}},{"id":4605614,"issuer":{"id":159180,"kind":"organization","name":"Asterias Biotherapeutics, Inc.","symbol":"NONE"},"owners":[{"id":158917,"kind":"person","name":"Wirth Edward","position":1,"cik":"0001532558","reported_name":"Wirth Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2016-09-12T17:00:39.000Z","date":"2016-09-09","kind":"sale","acquired":false,"shares":3179,"price":3.581,"value":11383.999,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares reported herein were sold pursuant to a Rule 10b5-1 Plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $3.50 to $3.59, inclusive. The reporting person undertakes to provide to any security holder of the Issuer 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 to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Excludes 10,941 Restricted Stock Units payable in shares of the Issuer's common stock that have not vested as of the date of this Report."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001140361-16-079564","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1532558/000114036116079564/doc1.xml","form_type":"4"}},{"id":4605613,"issuer":{"id":159180,"kind":"organization","name":"Asterias Biotherapeutics, Inc.","symbol":"NONE"},"owners":[{"id":158917,"kind":"person","name":"Wirth Edward","position":1,"cik":"0001532558","reported_name":"Wirth Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2016-09-12T17:00:39.000Z","date":"2016-09-08","kind":"sale","acquired":false,"shares":11581,"price":3.5,"value":40533.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares reported herein were sold pursuant to a Rule 10b5-1 Plan adopted by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Excludes 10,941 Restricted Stock Units payable in shares of the Issuer's common stock that have not vested as of the date of this Report."}],"balance_after":3179,"source":{"system":"sec-edgar","filing":"0001140361-16-079564","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1532558/000114036116079564/doc1.xml","form_type":"4"}}]}