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The RSUs vest in three equal installments on each of February 24, 2022, February 18, 2023 and February 18, 2024."},{"field":"security","element":"securityTitle","label":"F3","text":"Each RSU represents a contingent right to receive one share of the issuer's common stock."},{"field":"shares","element":"transactionShares","label":"F1","text":"On February 24, 2022, the issuer awarded 25,000 restricted stock units (RSUs) to the reporting person upon confirmation by the issuer's compensation committee of satisfaction of certain performance criteria for the fiscal year ended December 31, 2021. The RSUs vest in three equal installments on each of February 24, 2022, February 18, 2023 and February 18, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On February 24, 2022, the issuer awarded 25,000 restricted stock units (RSUs) to the reporting person upon confirmation by the issuer's compensation committee of satisfaction of certain performance criteria for the fiscal year ended December 31, 2021. The RSUs vest in three equal installments on each of February 24, 2022, February 18, 2023 and February 18, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On February 24, 2022, the issuer awarded 25,000 restricted stock units (RSUs) to the reporting person upon confirmation by the issuer's compensation committee of satisfaction of certain performance criteria for the fiscal year ended December 31, 2021. 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Under the terms of the plan, the reporting person is being granted RSUs in lieu of a percentage of the reporting person's cash compensation for the period between April 6, 2020 and July 10, 2020."},{"field":"date","element":"transactionDate","label":"F2","text":"Each RSU represents a contingent right to receive one share of the issuer's common stock. The RSUs vest in full on July 10, 2020."},{"field":"shares","element":"transactionShares","label":"F1","text":"On April 6, 2020, the restricted stock units (RSUs) were granted to the reporting person in connection with the reporting person's election to participate in the issuer's employee salary conversion plan, which was adopted by the Compensation Committee of the issuer's board of directors on April 1, 2020 in response to the novel coronavirus (COVID-19) and the financial impact on the issuer resulting therefrom. Under the terms of the plan, the reporting person is being granted RSUs in lieu of a percentage of the reporting person's cash compensation for the period between April 6, 2020 and July 10, 2020."},{"field":"shares","element":"transactionShares","label":"F2","text":"Each RSU represents a contingent right to receive one share of the issuer's common stock. The RSUs vest in full on July 10, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The conversion price (cash for equity) is based on a 30-day volume weighted average price of the issuer's common stock as of close of market on Friday, April 3, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On April 6, 2020, the restricted stock units (RSUs) were granted to the reporting person in connection with the reporting person's election to participate in the issuer's employee salary conversion plan, which was adopted by the Compensation Committee of the issuer's board of directors on April 1, 2020 in response to the novel coronavirus (COVID-19) and the financial impact on the issuer resulting therefrom. Under the terms of the plan, the reporting person is being granted RSUs in lieu of a percentage of the reporting person's cash compensation for the period between April 6, 2020 and July 10, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Each RSU represents a contingent right to receive one share of the issuer's common stock. The RSUs vest in full on July 10, 2020."}],"balance_after":498489,"source":{"system":"sec-edgar","filing":"0001179110-20-004799","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911020004799/edgar.xml","form_type":"4"}},{"id":3213096,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. Dev."}}],"security":"Common Stock","published_at":"2020-03-13T00:13:05.000Z","date":"2020-03-11","kind":"purchase","acquired":true,"shares":45000,"price":4.48,"value":201600.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.41 to $4.50, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,726 shares and 3,179 shares acquired under the issuer's employee stock purchase plan on November 15, 2018 and November 15, 2019, respectively."}],"balance_after":493007,"source":{"system":"sec-edgar","filing":"0001179110-20-003605","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911020003605/edgar.xml","form_type":"4"}},{"id":3213095,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. Dev."}}],"security":"Common Stock","published_at":"2020-03-13T00:11:48.000Z","date":"2018-05-17","kind":"exercise","acquired":true,"shares":31747,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series B Convertible Preferred Stock had no expiration date and converted into 317.4603 shares of the issuer's common stock on May 17, 2018, the date that issuer's stockholders approved such conversion."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,140 shares acquired under the issuer's employee stock purchase plan on May 15, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"On May 21, 2018, the reporting person mistakenly reported in Box 5 of Table I that following the reported transaction he beneficially owned 113,887 shares of the issuer's common stock.  This amendment is being filed to report the correct number of shares beneficially owned by the reporting person following the subject transaction, which was 163,887."}],"balance_after":163887,"source":{"system":"sec-edgar","filing":"0001179110-20-003604","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911020003604/edgar.xml","form_type":"4/A","original_submission_date":"2018-05-21"}},{"id":3525603,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. Dev."}}],"security":"Common Stock","published_at":"2019-05-16T00:12:33.000Z","date":"2019-05-13","kind":"grant","acquired":true,"shares":44335,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F2","text":"On May 13, 2019, issuer granted to the reporting person 44,335 restricted stock units, subject to stockholder approval of an amendment to issuer's 2016 Equity Incentive Plan to increase the number of shares authorized for issuance under the plan by 4,000,000 shares. The restricted stock units vest on the fourth anniversary of grant date; provided, however, that no portion of such restricted stock units shall vest unless the publicly-traded stock price for the issuer's common stock at the close of the market on such fourth anniversary date is equal to or greater than $6.18 per share (representing a 50% increase in the price per share as of the grant date)."},{"field":"shares","element":"transactionShares","label":"F2","text":"On May 13, 2019, issuer granted to the reporting person 44,335 restricted stock units, subject to stockholder approval of an amendment to issuer's 2016 Equity Incentive Plan to increase the number of shares authorized for issuance under the plan by 4,000,000 shares. The restricted stock units vest on the fourth anniversary of grant date; provided, however, that no portion of such restricted stock units shall vest unless the publicly-traded stock price for the issuer's common stock at the close of the market on such fourth anniversary date is equal to or greater than $6.18 per share (representing a 50% increase in the price per share as of the grant date)."},{"field":"shares","element":"transactionShares","label":"F3","text":"Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 4520 shares acquired under the issuer's employee stock purchase plan on May 15, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On May 13, 2019, issuer granted to the reporting person 44,335 restricted stock units, subject to stockholder approval of an amendment to issuer's 2016 Equity Incentive Plan to increase the number of shares authorized for issuance under the plan by 4,000,000 shares. The restricted stock units vest on the fourth anniversary of grant date; provided, however, that no portion of such restricted stock units shall vest unless the publicly-traded stock price for the issuer's common stock at the close of the market on such fourth anniversary date is equal to or greater than $6.18 per share (representing a 50% increase in the price per share as of the grant date)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."}],"balance_after":391102,"source":{"system":"sec-edgar","filing":"0001179110-19-006128","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911019006128/edgar.xml","form_type":"4"}},{"id":3525602,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. Dev."}}],"security":"Common Stock","published_at":"2019-05-16T00:12:33.000Z","date":"2019-05-13","kind":"grant","acquired":true,"shares":177340,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"On May 13, 2019, issuer granted to the reporting person 177,340 restricted stock units, subject to stockholder approval of an amendment to issuer's 2016 Equity Incentive Plan to increase the number of shares authorized for issuance under the plan by 4,000,000 shares. The restricted stock units vest in four equal installments on each of the first four anniversaries of the grant date; provided, however, that no portion of the restricted stock units shall vest at any time during the first four years following the grant date unless and until the publicly-traded stock price for the issuer's common stock reaches a 30-day average trading price equal to or above $5.36 per share (representing a 30% increase in the price per share as of the grant date). Should the publicly traded stock price for the issuer's common stock reach a 30-day average trading price at or above $5.36 per share, this pricing condition on the vesting of the restricted stock units shall be satisfied, and shall terminate."},{"field":"shares","element":"transactionShares","label":"F1","text":"On May 13, 2019, issuer granted to the reporting person 177,340 restricted stock units, subject to stockholder approval of an amendment to issuer's 2016 Equity Incentive Plan to increase the number of shares authorized for issuance under the plan by 4,000,000 shares. The restricted stock units vest in four equal installments on each of the first four anniversaries of the grant date; provided, however, that no portion of the restricted stock units shall vest at any time during the first four years following the grant date unless and until the publicly-traded stock price for the issuer's common stock reaches a 30-day average trading price equal to or above $5.36 per share (representing a 30% increase in the price per share as of the grant date). Should the publicly traded stock price for the issuer's common stock reach a 30-day average trading price at or above $5.36 per share, this pricing condition on the vesting of the restricted stock units shall be satisfied, and shall terminate."},{"field":"shares","element":"transactionShares","label":"F3","text":"Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On May 13, 2019, issuer granted to the reporting person 177,340 restricted stock units, subject to stockholder approval of an amendment to issuer's 2016 Equity Incentive Plan to increase the number of shares authorized for issuance under the plan by 4,000,000 shares. The restricted stock units vest in four equal installments on each of the first four anniversaries of the grant date; provided, however, that no portion of the restricted stock units shall vest at any time during the first four years following the grant date unless and until the publicly-traded stock price for the issuer's common stock reaches a 30-day average trading price equal to or above $5.36 per share (representing a 30% increase in the price per share as of the grant date). Should the publicly traded stock price for the issuer's common stock reach a 30-day average trading price at or above $5.36 per share, this pricing condition on the vesting of the restricted stock units shall be satisfied, and shall terminate."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."}],"balance_after":342247,"source":{"system":"sec-edgar","filing":"0001179110-19-006128","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911019006128/edgar.xml","form_type":"4"}},{"id":3856538,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. Dev."}}],"security":"Employee Stock Option (right to buy)","published_at":"2018-08-02T00:31:27.000Z","date":"2018-07-30","kind":"grant","acquired":true,"shares":74222,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option will vest 25% on the first anniversary of the grant date and thereafter in 36 equal monthly installments; provided, however, that no portion of the option shall be exercisable at any time during the first four years following the grant date unless and until the publicly-traded stock price for the securities underlying the option reaches a 30-day average trading price equal to or above $4.20 per share. Should the publicly-traded stock price for the securities underlying the option reach a 30-day average trading price at or above $4.20 per share, this pricing condition on the exercise of the option shall be satisfied, and shall terminate."}],"balance_after":74222,"derivative":{"exercise_price":2.69,"exercise_date":"2019-07-30","expiration_date":"2028-07-30","underlying":"Common Stock","underlying_shares":74222},"source":{"system":"sec-edgar","filing":"0001179110-18-010077","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911018010077/edgar.xml","form_type":"4"}},{"id":3856537,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. Dev."}}],"security":"Common Stock","published_at":"2018-08-02T00:31:27.000Z","date":"2018-07-30","kind":"grant","acquired":true,"shares":51020,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"On July 30, 2018, issuer granted to the reporting person 51,020 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."},{"field":"date","element":"transactionDate","label":"F2","text":"The restricted stock units vest in four equal installments on each of the first four anniversaries of the grant date."},{"field":"shares","element":"transactionShares","label":"F1","text":"On July 30, 2018, issuer granted to the reporting person 51,020 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."},{"field":"shares","element":"transactionShares","label":"F2","text":"The restricted stock units vest in four equal installments on each of the first four anniversaries of the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On July 30, 2018, issuer granted to the reporting person 51,020 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of issuer's common stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The restricted stock units vest in four equal installments on each of the first four anniversaries of the grant date."}],"balance_after":164907,"source":{"system":"sec-edgar","filing":"0001179110-18-010077","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911018010077/edgar.xml","form_type":"4"}},{"id":3923660,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. 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Mktg. & Prod. Dev."}}],"security":"Warrants (right to buy)","published_at":"2018-03-12T22:12:10.000Z","date":"2018-03-08","kind":"grant","acquired":true,"shares":26985,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each Warrant is exercisable for 1 share of the issuer's common stock for a period of five years following the date that stockholder approval is obtained."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each Warrant is exercisable for 1 share of the issuer's common stock for a period of five years following the date that stockholder approval is obtained."}],"balance_after":26985,"derivative":{"exercise_price":3.5,"underlying":"Common Stock","underlying_shares":26985},"source":{"system":"sec-edgar","filing":"0001179110-18-004084","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1350653/000117911018004084/edgar.xml","form_type":"4"}},{"id":4000717,"issuer":{"id":4720,"kind":"organization","name":"Alphatec Holdings, Inc.","symbol":"ATEC"},"owners":[{"id":124746,"kind":"person","name":"Snider Brian","position":1,"cik":"0001702383","reported_name":"Snider Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Strat. Mktg. & Prod. 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