The Company and Basis of Presentation	12 Months Ended
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
The Company and Basis of Presentation	1. The Company and Basis of Presentation The Company Alphatec Holdings, Inc. (the “Company”), through its wholly owned subsidiaries, Alphatec Spine, Inc. (“Alphatec Spine”) and SafeOp Surgical, Inc. (“SafeOp”), is a medical technology company that designs, develops, and markets technology for the treatment of spinal disorders associated with disease and degeneration, congenital deformities, and trauma. The Company markets its products in the U.S. via independent sales agents and a direct sales force. On March 6, 2018, the Company and its newly-created wholly-owned subsidiary, Safari Merger Sub, Inc. (“Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with SafeOp, a Delaware corporation, certain Key Stockholders of SafeOp and a Stockholder Representative. Pursuant to the Merger Agreement, a reverse triangular merger (the “Merger”) was consummated on March 8, 2018, in which Sub was merged into SafeOp, with SafeOp being the surviving corporation and a wholly-owned subsidiary of the Company. See Note 8 for further information. On September 1, 2016, the Company completed the sale of its international distribution operations and agreements (collectively, the “International Business”) to Globus Medical Ireland, Ltd., a subsidiary of Globus Medical, Inc., and its affiliated entities (collectively “Globus”). As a result of this transaction, the International Business has been excluded from continuing operations for all periods presented in this Annual Report on Form 10-K and is reported as discontinued operations. See Note 4 for additional information on the divestiture of the International Business. Basis of Presentation The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") and include the accounts of the Company, Alphatec Spine and SafeOp. All intercompany balances and transactions have been eliminated in consolidation. The Company operates in one reportable business segment. Liquidity The Company’s existing working capital at December 31, 2018 is $44.9 million (including cash of $29.1 million) which includes the net proceeds of $51.9 million received as of December 31, 2018 from the equity offering that closed on March 8, 2018 (see Note 10), warrant, employee stock purchase plan and stock option exercises, as well as the amendments to its debt facilities (see Note 5). The Company has incurred significant net losses since inception and has relied on its ability to fund its operations through revenues from the sale of its products, equity financings and debt financings. As the Company has historically incurred losses, successful transition to profitability is dependent upon achieving a level of revenues adequate to support the Company’s cost structure. This may not occur and, unless and until it does, the Company will continue to need to raise additional capital. Operating losses and negative cash flows may continue for at least the next year as the Company continues to incur costs related to the execution of its operating plan and introduction of new products. Should the Company be unable to raise additional capital from outside sources, this will have a material adverse impact on its operations. The Company’s Board approved annual operating plan projects that its existing working capital at December 31, 2018 along with the use of the Expanded Credit Facility with Squadron of $30.0 million that closed on March 27, 2019 (see Note 16), allows the Company to fund its operations through at least one year subsequent to the date the financial statements are issued. As more fully described in Note 5, the Company’s debt agreements include traditional lending and reporting covenants, including a financial covenant that requires the Company to maintain a minimum fixed charge coverage ratio beginning in April 2020 and a minimum liquidity covenant of $5.0 million effective through March 2020. Should at any time the Company fail to maintain compliance with these covenants, the Company will need to seek waivers or amendments to the debt agreements. If the Company is unable to secure such waivers or amendments, it may be required to classify its obligations under the debt agreements in current liabilities on its consolidated balance sheet. The Company may also be required to repay all or a portion of outstanding indebtedness under the debt agreements, which would require the Company to obtain further financing. There is no assurance that the Company will be able to obtain further financing, or do so on reasonable terms. Reclassification Certain amounts in the consolidated financial statements included in our Form 10-K for the year ended December 31, 2017 have been reclassified to conform to current period's presentation. These reclassifications include the depreciation expense for surgical instruments, which was reclassified, to be consistent with industry practice, out of cost of revenues and into sales, general and administrative expense on the Company’s consolidated statements of operations. This resulted in a reclassification of $5.3 million and $5.9 million of depreciation expense for the year ended December 31, 2018 and 2017, which was approximately 15% of total cost of revenues for each year. In addition, general and administrative expense for 2017 was combined into a single line item with sales and marketing expense for a new expense line titled “Sales, general and administrative expense” and litigation-related expenses primarily pertaining to the ongoing litigation with NuVasive, Inc. were classified out of selling, general and administrative expense on the Company’s consolidated statement of operations for the years ended December 31, 2018 and 2017 and onto its own expense line item. None of the adjustments had any effect on the prior period net losses.

The Company and Basis of Presentation

12 Months Ended

Dec. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. The Company and Basis of Presentation

The Company

Alphatec Holdings, Inc. (the “Company”), through its wholly owned subsidiaries, Alphatec Spine, Inc. (“Alphatec Spine”) and SafeOp Surgical, Inc. (“SafeOp”), is a medical technology company that designs, develops, and markets technology for the treatment of spinal disorders associated with disease and degeneration, congenital deformities, and trauma. The Company markets its products in the U.S. via independent sales agents and a direct sales force.

On March 6, 2018, the Company and its newly-created wholly-owned subsidiary, Safari Merger Sub, Inc. (“Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with SafeOp, a Delaware corporation, certain Key Stockholders of SafeOp and a Stockholder Representative. Pursuant to the Merger Agreement, a reverse triangular merger (the “Merger”) was consummated on March 8, 2018, in which Sub was merged into SafeOp, with SafeOp being the surviving corporation and a wholly-owned subsidiary of the Company. See Note 8 for further information.

On September 1, 2016, the Company completed the sale of its international distribution operations and agreements (collectively, the “International Business”) to Globus Medical Ireland, Ltd., a subsidiary of Globus Medical, Inc., and its affiliated entities (collectively “Globus”). As a result of this transaction, the International Business has been excluded from continuing operations for all periods presented in this Annual Report on Form 10-K and is reported as discontinued operations. See Note 4 for additional information on the divestiture of the International Business.

Basis of Presentation

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") and include the accounts of the Company, Alphatec Spine and SafeOp. All intercompany balances and transactions have been eliminated in consolidation. The Company operates in one reportable business segment.

Liquidity

The Company’s existing working capital at December 31, 2018 is $44.9 million (including cash of $29.1 million) which includes the net proceeds of $51.9 million received as of December 31, 2018 from the equity offering that closed on March 8, 2018 (see Note 10), warrant, employee stock purchase plan and stock option exercises, as well as the amendments to its debt facilities (see Note 5).

The Company has incurred significant net losses since inception and has relied on its ability to fund its operations through revenues from the sale of its products, equity financings and debt financings. As the Company has historically incurred losses, successful transition to profitability is dependent upon achieving a level of revenues adequate to support the Company’s cost structure. This may not occur and, unless and until it does, the Company will continue to need to raise additional capital. Operating losses and negative cash flows may continue for at least the next year as the Company continues to incur costs related to the execution of its operating plan and introduction of new products. Should the Company be unable to raise additional capital from outside sources, this will have a material adverse impact on its operations.

The Company’s Board approved annual operating plan projects that its existing working capital at December 31, 2018 along with the use of the Expanded Credit Facility with Squadron of $30.0 million that closed on March 27, 2019 (see Note 16), allows the Company to fund its operations through at least one year subsequent to the date the financial statements are issued.

As more fully described in Note 5, the Company’s debt agreements include traditional lending and reporting covenants, including a financial covenant that requires the Company to maintain a minimum fixed charge coverage ratio beginning in April 2020 and a minimum liquidity covenant of $5.0 million effective through March 2020. Should at any time the Company fail to maintain compliance with these covenants, the Company will need to seek waivers or amendments to the debt agreements. If the Company is unable to secure such waivers or amendments, it may be required to classify its obligations under the debt agreements in current liabilities on its consolidated balance sheet. The Company may also be required to repay all or a portion of outstanding indebtedness under the debt agreements, which would require the Company to obtain further financing. There is no assurance that the Company will be able to obtain further financing, or do so on reasonable terms.

Reclassification

Certain amounts in the consolidated financial statements included in our Form 10-K for the year ended December 31, 2017 have been reclassified to conform to current period's presentation. These reclassifications include the depreciation expense for surgical instruments, which was reclassified, to be consistent with industry practice, out of cost of revenues and into sales, general and administrative expense on the Company’s consolidated statements of operations. This resulted in a reclassification of $5.3 million and $5.9 million of depreciation expense for the year ended December 31, 2018 and 2017, which was approximately 15% of total cost of revenues for each year. In addition, general and administrative expense for 2017 was combined into a single line item with sales and marketing expense for a new expense line titled “Sales, general and administrative expense” and litigation-related expenses primarily pertaining to the ongoing litigation with NuVasive, Inc. were classified out of selling, general and administrative expense on the Company’s consolidated statement of operations for the years ended December 31, 2018 and 2017 and onto its own expense line item. None of the adjustments had any effect on the prior period net losses.