Alphatec (ATEC) 10-Q 3 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Cover [Abstract]
Entity Registrant Name	ALPHATEC HOLDINGS, INC.
Entity Central Index Key	0001350653
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Trading Symbol	ATEC
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Entity Current Reporting Status	Yes
Amendment Flag	false
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		100,117,176
Entity Shell Company	false
Entity File Number	000-52024
Entity Tax Identification Number	20-2463898
Entity Address, Address Line One	1950 Camino Vida Roble
Entity Address, City or Town	Carlsbad
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92008
City Area Code	760
Local Phone Number	431-9286
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock, par value $.0001 per share
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash	$ 76,581	$ 107,765
Accounts receivable, net	33,743	23,527
Inventories, net	86,715	46,001
Prepaid expenses and other current assets	8,108	5,439
Withholding tax receivable from Officer	1,076	1,076
Current assets of discontinued operations	136	352
Total current assets	206,359	184,160
Property and equipment, net	66,051	36,670
Right-of-use asset	26,604	1,177
Goodwill	45,189	13,897
Intangible assets, net	92,981	24,720
Other assets	3,786	541
Noncurrent assets of discontinued operations	57	58
Total assets	441,027	261,223
Current liabilities:
Accounts payable	29,812	17,599
Accrued expenses and other current liabilities	43,455	35,264
Contract liability	20,392
Short-term debt	10,988	4,167
Current portion of operating lease liability	2,777	885
Current liabilities of discontinued operations	141	397
Total current liabilities	107,565	58,312
Long-term debt	55,789	37,999
Operating lease liability, less current portion	25,413	41
Other long-term liabilities	15,143	11,388
Commitments and contingencies (Note 6)
Redeemable preferred stock, $0.0001 par value; 20,000 shares authorized at June 30, 2021 and December 31, 2020; 3,319 shares issued and outstanding at June 30, 2021 and December 31, 2020	23,603	23,603
Stockholders' equity:
Common stock, $0.0001 par value; 200,000 authorized; 100,184 shares issued and 100,049 shares outstanding at June 30, 2021; and 82,294 shares issued and 82,104 shares outstanding at December 31, 2020	10	8
Treasury stock, 2 shares, at cost	(97)	(97)
Additional paid-in capital	914,659	770,764
Shareholder note receivable	(1,800)	(4,000)
Accumulated other comprehensive income	(151)	1,204
Accumulated deficit	(699,107)	(637,999)
Total stockholders’ equity	213,514	129,880
Total liabilities and stockholders’ equity	$ 441,027	$ 261,223

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Redeemable preferred stock, par value (dollars per share)	$ 0.0001	$ 0.0001
Redeemable preferred stock, shares authorized	20,000,000	20,000,000
Redeemable preferred stock, shares issued	3,319,000	3,319,000
Redeemable preferred stock, shares outstanding	3,319,000	3,319,000
Common stock, par value (dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	100,184,000	82,294,000
Common stock, shares outstanding	100,049,000	82,104,000
Treasury stock, shares	2,000	2,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Revenue	$ 62,249	$ 29,629	$ 106,370	$ 59,744
Cost of revenue	21,184	8,787	33,447	17,871
Gross profit	41,065	20,842	72,923	41,873
Operating expenses:
Research and development	7,839	4,237	13,640	8,406
Sales, general and administrative	60,659	26,468	101,085	54,051
Litigation-related expenses	1,167	1,304	4,502	3,947
Amortization of acquired intangible assets	1,208	172	1,380	344
Transaction-related expenses	4,771	(181)	5,783	4,091
Restructuring costs	1,173		1,331
Total operating expenses	76,817	32,000	127,721	70,839
Operating loss	(35,752)	(11,158)	(54,798)	(28,966)
Interest and other expense, net:
Interest expense, net	(2,394)	(3,032)	(4,332)	(5,906)
Other expense, net	(16)	(1,555)	(1,905)	(1,555)
Total interest and other expense, net	(2,410)	(4,587)	(6,237)	(7,461)
Net loss before taxes	(38,162)	(15,745)	(61,035)	(36,427)
Income tax provision	43	60	73	100
Net loss	$ (38,205)	$ (15,805)	$ (61,108)	$ (36,527)
Net loss per share, basic and diluted	$ (0.39)	$ (0.25)	$ (0.66)	$ (0.58)
Weighted-average shares outstanding, basic and diluted	98,541	63,713	92,912	63,140
Products and Services
Revenue:
Revenue	$ 61,885	$ 28,834	$ 105,601	$ 57,904
International Supply Agreement
Revenue:
Revenue	$ 364	$ 795	$ 769	$ 1,840

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (38,205)	$ (15,805)	$ (61,108)	$ (36,527)
Foreign currency translation adjustments	1,697	6	(1,355)	75
Comprehensive loss	$ (36,508)	$ (15,799)	$ (62,463)	$ (36,452)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional paid-in capital	Shareholder note receivable	Treasury stock	Accumulated other comprehensive income (loss)	Accumulated deficit	Accumulated deficitCumulative Effect, Period of Adoption, Adjustment
Balance at Dec. 31, 2019	$ 43,631	$ (81)	$ 6	$ 606,558	$ (5,000)	$ (97)	$ 1,088	$ (558,924)	$ (81)
Balance, shares at Dec. 31, 2019			61,400
Accounting Standards Update Extensible List	us-gaap:AccountingStandardsUpdate201908Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 3,630			3,630
Distributor equity incentives	70			70
Common stock issued for warrant exercises	1,158			1,158
Common stock issued for warrant exercises, shares			1,390
Common stock issued for stock option exercises	83			83
Common stock issued for stock option exercises, shares			76
Common stock issued for vesting of restricted stock awards, net of shares retained for tax liability	(408)			(408)
Common stock issued for vesting of restricted stock awards, net of shares retained for tax liability, shares			394
Foreign currency translation adjustments	69						69
Net loss	(20,722)							(20,722)
Balance at Mar. 31, 2020	27,430		$ 6	611,091	(5,000)	(97)	1,157	(579,727)
Balance, shares at Mar. 31, 2020			63,260
Balance at Dec. 31, 2019	43,631	$ (81)	$ 6	606,558	(5,000)	(97)	1,088	(558,924)	$ (81)
Balance, shares at Dec. 31, 2019			61,400
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustments	75
Net loss	(36,527)
Balance at Jun. 30, 2020	18,822		$ 6	618,282	(5,000)	(97)	1,163	(595,532)
Balance, shares at Jun. 30, 2020			63,849
Balance at Mar. 31, 2020	27,430		$ 6	611,091	(5,000)	(97)	1,157	(579,727)
Balance, shares at Mar. 31, 2020			63,260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3,608			3,608
Distributor equity incentives	51			51
Common stock issued for employee stock purchase plan and stock option exercises	722			722
Common stock issued for employee stock purchase plan and stock option exercises, shares			202
Common stock issued for vesting of restricted stock awards, net of shares retained for tax liability	(164)			(164)
Common stock issued for vesting of restricted stock awards, net of shares retained for tax liability, shares			387
Issuance of common stock warrants, net	2,974			2,974
Foreign currency translation adjustments	6						6
Net loss	(15,805)							(15,805)
Balance at Jun. 30, 2020	18,822		$ 6	618,282	(5,000)	(97)	1,163	(595,532)
Balance, shares at Jun. 30, 2020			63,849
Balance at Dec. 31, 2020	129,880		$ 8	770,764	(4,000)	(97)	1,204	(637,999)
Balance, shares at Dec. 31, 2020			82,104
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3,889			3,889
Distributor equity incentives	129			129
Common stock issued for warrant exercises	756			756
Common stock issued for warrant exercises, shares			2,019
Common stock issued for employee stock purchase plan and stock option exercises	210			210
Common stock issued for employee stock purchase plan and stock option exercises, shares			69
Common stock issued for vesting of restricted stock awards, net of shares retained for tax liability	(1,717)			(1,717)
Common stock issued for vesting of restricted stock awards, net of shares retained for tax liability, shares			379
Shareholder note receivable	1,100				1,100
Foreign currency translation adjustments	(3,052)						(3,052)
Net loss	(22,903)							(22,903)
Balance at Mar. 31, 2021	108,292		$ 8	774,031	(2,900)	(97)	(1,848)	(660,902)
Balance, shares at Mar. 31, 2021			84,571
Balance at Dec. 31, 2020	129,880		$ 8	770,764	(4,000)	(97)	1,204	(637,999)
Balance, shares at Dec. 31, 2020			82,104
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustments	(1,355)
Net loss	(61,108)
Balance at Jun. 30, 2021	213,514		$ 10	914,659	(1,800)	(97)	(151)	(699,107)
Balance, shares at Jun. 30, 2021			100,049
Balance at Mar. 31, 2021	108,292		$ 8	774,031	(2,900)	(97)	(1,848)	(660,902)
Balance, shares at Mar. 31, 2021			84,571
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	11,187			11,187
Distributor equity incentives	94			94
Common stock issued for warrant exercises	1,729			1,729
Common stock issued for warrant exercises, shares			1,576
Common stock issued for employee stock purchase plan and stock option exercises	1,479			1,479
Common stock issued for employee stock purchase plan and stock option exercises, shares			356
Common stock issued for vesting of performance and restricted stock awards, net of shares retained for tax liability	(5,687)			(5,687)
Common stock issued for vesting of performance and restricted stock awards, net of shares repurchased for tax liability, shares			1,125
Issuance of common stock for public offering, net of offering costs	131,828		$ 2	131,826
Issuance of common stock for public offering, net of offering costs, shares			12,421
Shareholder note receivable	1,100				1,100
Foreign currency translation adjustments	1,697						1,697
Net loss	(38,205)							(38,205)
Balance at Jun. 30, 2021	$ 213,514		$ 10	$ 914,659	$ (1,800)	$ (97)	$ (151)	$ (699,107)
Balance, shares at Jun. 30, 2021			100,049

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) $ in Thousands	3 Months Ended
	Jun. 30, 2021USD ($)
Statement Of Stockholders Equity [Abstract]
Common stock public offering cost	$ 6,200

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net loss	$ (61,108)	$ (36,527)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	10,394	5,056
Stock-based compensation	15,970	8,143
Amortization of debt discount and debt issuance costs	1,292	2,376
Amortization of right-of-use assets	1,950	527
Provision for doubtful accounts	12	22
Provision for excess and obsolete inventory	4,317	3,434
Loss on disposal of instruments	689	144
Loss on extinguishment of debt		1,555
Other	1,991
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	(1,261)	(3,657)
Inventories	(15,195)	(10,047)
Prepaid expenses and other current assets	1,515	(1,061)
Other assets	145
Accounts payable	3,797	5,883
Accrued expenses and other current liabilities	(506)	(2,549)
Lease liability	(26)	(644)
Other long-term liabilities	914	(2,800)
Net cash used in operating activities	(35,110)	(30,145)
Investing activities:
Purchase of property and equipment	(36,028)	(6,978)
Acquisition of business, net of cash acquired	(62,133)
Cash paid for investments	(3,000)
Settlement of forward contract	(2,589)
Net cash used in investing activities	(124,847)	(6,978)
Financing activities:
Proceeds from public offering	131,828
Net cash (paid) received from common stock exercises	(3,044)	1,379
Borrowings under lines of credit		42,455
Repayments under lines of credit		(56,615)
Principal payments on capital lease obligations	(2)	(18)
Proceeds from issuance of term debt, net		33,921
Principal payments on term loan and notes payable	(13)	(24)
Net cash provided by financing activities	128,769	21,098
Effect of exchange rate changes on cash	4	75
Net decrease in cash	(31,184)	(15,950)
Cash at beginning of period, including discontinued operations	107,765	47,113
Cash at end of period, including discontinued operations	76,581	31,163
Supplemental disclosure of cash flow information:
Cash paid for interest	3,476	3,534
Cash paid for income taxes	225	166
Supplemental disclosure of noncash investing activities:
Common stock issued with term loan draw		2,986
Purchases of property and equipment in accounts payable	591	$ 2,290
Recognition of lease liability	23,159
OCEANE
Investing activities:
Acquisition of business, net of cash acquired	$ (21,097)

The Company and Basis of Presen

The Company and Basis of Presentation	6 Months Ended
	Jun. 30, 2021
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”), SafeOp Surgical, Inc. (“SafeOp”), and EOS imaging S.A. (“EOS”), 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. and internationally via independent sales agents and a direct sales force. On September 1, 2016, the Company completed the sale of its previous international distribution operations and agreements to Globus Medical Ireland, Ltd., a subsidiary of Globus Medical, Inc., and its affiliated entities (collectively “Globus”). As a result of this transaction, the previous international distribution transactions are reported as discontinued operations in the condensed consolidated financial statements. See Note 5 for additional information on the divestiture of the previous international distribution business. Recent Developments On May 13, 2021, the Company acquired a controlling interest in EOS, pursuant to the Tender Offer Agreement (the “Tender Offer Agreement”) it entered on December 16, 2020, and subsequently purchased the remaining issued and outstanding ordinary shares for a 100% interest in the company. is a global medical device company that designs, develops and markets innovative, low dose 2D/3D full body and weight-bearing imaging, rapid 3D modeling of EOS patient X-ray images, web-based patient-specific surgical planning, and integration of surgical plan into the operating room that collectively bridge the entire spectrum of care from imaging to post-operative assessment capabilities for orthopedic surgery. Basis of Presentation and Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. The Company translates the financial statements of its foreign subsidiaries using end-of-period exchange rates for assets and liabilities and average exchange rates during each reporting period for results of operations. All intercompany balances and transactions have been eliminated during consolidation. The accompanying condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Pursuant to these rules and regulations, the Company has condensed or omitted certain information and footnotes it normally includes in its annual consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”). Reclassification Certain amounts in the condensed consolidated financial statements for the three and six months ended June 30, 2020 have been reclassified to conform to the current period’s presentation. These reclassifications were immaterial and had no impact on previously reported results of operations or accumulated deficit.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies The Company’s significant accounting policies are described in Note 2 to its audited consolidated financial statements for the year ended December 31, 2020, which are included in the Company’s Annual Report on Form 10-K that was filed with the SEC on March 5, 2021. Except as discussed below, these accounting policies have not changed during the six months ended June 30, 2021. Revenue Recognition The Company recognizes revenue from products sales in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“Topic 606”). This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaboration arrangements and financial instruments. Under Topic 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of Topic 606, the entity performs the following five steps: ( i ) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The Company only applies the five-step model to contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. Sales are derived primarily from the sale of spinal implant products to hospitals and medical centers through direct sales representatives and independent distributor agents, and now includes imaging equipment and related services with the acquisition of EOS. Revenue is recognized when obligations under the terms of a contract with customers are satisfied, which occurs with the transfer of control of products to customers, either upon shipment of the product or delivery of the product to the customer depending on the shipping terms, or when the products are used in a surgical procedure (implanted in a patient). Revenue from the sale of imaging equipment is recognized as each distinct performance obligation is fulfilled and control transfers to the customer, beginning with shipment or delivery, depending on the terms. Revenue from other distinct performance obligations, such as maintenance on imaging equipment, training services, and other imaging related services, is recognized in the period the service is performed, and makes up less than 10% of the Company’s total revenue. Revenue is measured based on the amount of consideration expected to be received in exchange for the transfer of the goods or services specified in the contract with each customer. In certain cases, the Company does offer the ability for customers to lease its imaging equipment primarily on a non-sales type basis, but such arrangements are immaterial to total revenue in the periods presented. The Company generally does not allow returns of products that have been delivered and will recognize such revenue when the Company concludes there is not a risk of significant revenue reversal in future periods for the expected consideration in the transaction. Costs incurred by the Company associated with sales contracts with customers are deferred over the performance obligation period and recognized in the same period as the related revenue, with the exception of contracts that complete within one year or less, in which case the associated costs are expensed as incurred. Payment terms for sales to customers may vary but are commensurate with the general business practices in the country of sale. To the extent that the transaction price includes variable consideration, such as discounts, rebates, and customer payment penalties, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method depending on the nature of the variable consideration. Variable consideration is included in the transaction price if, in the Company’s judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of our anticipated performance and all information that is reasonably available, including historical, current, and forecasted information. The Company records a contract liability, or deferred revenue, when it has an obligation to provide a product or service to the customer and payment is received or due in advance of its performance. When the Company sells a product or service with a future performance obligation, revenue is deferred on the unfulfilled performance obligation and recognized over the related performance period. Generally, the Company does not have observable evidence of the standalone selling price related to its future service obligations; therefore, the Company estimates the selling price using an expected cost plus a margin approach. The transaction price is allocated using the relative standalone selling price method. The use of alternative estimates could result in a different amount of revenue deferral. The Company recognized $3.4 million of revenue from its contract liabilities during the three and six months ended June 30, 2021. The opening and closing balances of the Company’s contract liability are as follows: Balance at January 1, 2021 $ — Contract liability assumed from EOS 21,196 Payments received 2,586 Revenue recognized (3,390 ) Balance at June 30, 2021 $ 20,392 Fair Value Measurements T he carrying amount of financial instruments consisting of cash, accounts receivable, prepaid expenses and other current assets, accounts payable, accrued expenses, and short-term debt included in the Company’s condensed consolidated financial statements are reasonable estimates of fair value due to their short maturities. Based on the borrowing rates currently available to the Company for loans with similar terms, management believes the fair value of long-term debt approximates its carrying value. Authoritative guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1: Quoted prices in active markets for identical assets or liabilities. Level 2: Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active; or other inputs that can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The following table presents information related to the Company’s liabilities measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 (in thousands): June 30, 2021 Liabilities: Level 1 Level 2 Level 3 Total Liability classified equity award (1) $ — — 4,404 $ 4,404 Foreign currency forward contract — 151 — 151 Total $ — 151 4,404 $ 4,555 December 31, 2020 Liabilities: Level 1 Level 2 Level 3 Total Liability classified equity award (1) $ — — 4,108 $ 4,108 Foreign currency forward contract — 878 — 878 Total $ — 878 4,108 $ 4,986 (1) A portion of this award is being accreted over the requisite service period. The Company did not have any transfers of assets and liabilities between the levels of the fair value measurement hierarchy during the periods presented. On March 16, 2021, the Company entered into two foreign currency forward contracts, with a notional amount of $8.0 million total ($4.0 million each) or €6.7 million total (€3.3 million each) to mitigate the foreign currency exchange risk related to its EOS subsidiary. The contracts are not designated as hedging instruments. The Company classified the derivative liabilities within Level 2 of the fair value hierarchy as observable inputs are available for the full term of the derivative instruments. The fair value of the forward contracts was developed using a market approach based on publicly available market yield curves and the term of the contracts. The Company recognized a nominal loss from the change in fair value of the contracts during the six months ended June 30, 2021. The loss on the change in fair value of the contracts was recorded as other expense on the condensed consolidated statement of operations. On December 18, 2020, the Company entered into a foreign currency forward contract, with a notional amount of $117.9 million (€95.6 million) to mitigate the foreign currency exchange risk related to the Tender Offer Agreement, denominated in Euros ("EUR"). The contract is not designated as a hedging instrument. The Company classified the derivative liability within Level 2 of the fair value hierarchy as observable inputs are available for the full term of the derivative instrument. The fair value of the forward contract was developed using a market approach based on publicly available market yield curves and the term of the contract. On March 2, 2021, the foreign currency forward contract was settled for €95.6 million ($115.3 million). The Company recognized a $1.7 million loss from the change in fair value of the contract during the six months ended June 30, 2021. The loss on the contract settlement was recorded as other expense on the condensed consolidated statement of operations and the cash settlement is included in investing activities in the condensed consolidated statement of cash flows for the six months ended June 30, 2021. During the second quarter of 2019, the Company issued a liability classified equity award to one of its executive officers. The award will be earned over a 4-year vesting period and upon a specific market condition. As the award will be settled in cash, it is classified as a liability within Level 3 of the fair value hierarchy as the Company is using a probability-weighted income approach, utilizing significant unobservable inputs including the probability of achieving the specified market condition with the valuation updated at each reporting period. The full fair value of the cash settled award was $ million as of June 30, 2021 and is being recognized ratably as the underlying service period is provided. The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2021 (in thousands): Level 3 Liabilities Balance at January 1, 2021 $ 1,668 Vested portion of liability classified equity award 258 Change in fair value measurement 199 Balance at March 31, 2021 $ 2,125 Vested portion of liability classified equity award 283 Change in fair value measurement (68 ) Balance at June 30, 2021 $ 2,340 Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In August 2020, the FASB issued Accounting Standard Update (“ASU”) No. 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging-Contracts in Entity’s Own Equity (Subtopic 815-40) (“ ”) In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848) Recently Issued Accounting Pronouncements In May 2021, the FASB issued ASU No. 2021-04, Earnings Per Share (Topic 260), Debt—Modifications and Extinguishments (Subtopic 470-50), Compensation—Stock Compensation (Topic 718), and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options

Business Combination

Business Combination	6 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Business Combination	3. Business Combination The Company recognizes assets acquired, liabilities assumed, and any noncontrolling interest at fair value at the date of acquisition. On December 16, 2020, the Company entered into the Tender Offer Agreement with EOS, pursuant to which the Company agreed to commence a public tender offer (the “Offer”) to purchase all of the issued and outstanding ordinary shares, nominal value €0.01 per share (collectively, the “EOS Shares”) for a cash offer of €2.45 per EOS Share, and outstanding convertible bonds of EOS (“OCEANEs”) for a cash offer of €7.01 per OCEANE, which included accrued but unpaid interest. On May 13, 2021 (the “Initial Offer Period”), the Company substantially completed the Offer, pursuant to which the Company purchased 59% of the issued and outstanding EOS Shares and 53% of the OCEANEs for $66.5 million in cash pursuant to the Offer. In addition, prior to the closing of the Initial Offer Period, the Company had also acquired 30% of the issued and outstanding EOS Shares and 4% of the OCEANEs on the open market for $25.0 million in cash. After the completion of the Initial Offer Period, the Company held a controlling financial interest in EOS representing 89% of issued and outstanding EOS Shares and 57% of OCEANEs, equal to approximately 80% of the capital and voting rights of EOS on a fully diluted basis. The Offer was reopened on May 17, 2021 to purchase the remaining EOS Shares for $8.5 million, ultimately resulting in the acquisition of 100% of EOS Shares and 57% of the OCEANEs as of June 2, 2021. As of June 2, 2021, the total cash paid to acquire 100% of the EOS Shares and 57% of the OCEANEs was $100.0 million. EOS, which now operates as a wholly owned subsidiary of the Company, is a global medical device company that designs, develops and markets innovative, low dose 2D/3D full body and weight-bearing imaging, rapid 3D modeling of EOS patient X-ray images, web-based patient-specific surgical planning, and integration of surgical plan into the operating room that collectively bridge the entire spectrum of care from imaging to post-operative assessment capabilities for orthopedic surgery. The Company plans to integrate this technology into its procedural approach to spine surgery in order to better inform and better achieve spinal alignment objectives in surgery. The Company is still in the process of finalizing the purchase price allocation given the timing of the acquisition and the size and scope of the assets and liabilities subject to valuation. While the Company does not expect material changes in the outcome of the valuation, certain assumptions and findings that were in place at the date of acquisition may result in changes in the purchase price allocation. The allocation of the purchase price to the assets acquired and liabilities assumed based on their fair values were as follows: (in thousands) As of May 13, 2021 Cash paid for purchase of EOS Shares in Initial Offer Period $ 46,908 Cash paid for purchase of OCEANEs in Initial Offer Period 19,620 Total cash paid in Initial Offer Period 66,528 Fair value of investment in EOS Shares held before the Initial Offer Period 23,549 Fair value of investment in OCEANEs held before the Initial Offer Period 1,477 Total fair value of investment in EOS held before the Initial Offer Period 25,026 Fair value of noncontrolling interest acquired subsequent to Initial Offer Period 8,454 $ 100,008 Cash and cash equivalents $ 16,778 Accounts receivable 9,083 Inventory 26,531 Other current assets 4,422 Property, plant and equipment, net 1,650 Right-of-use asset 4,341 Goodwill 31,822 Definite-lived intangible assets: Developed technology 56,000 Customer relationships 9,500 Trade names 6,000 Other noncurrent assets 395 Contract liabilities 21,196 Long-term debt 15,297 Other liabilities assumed 30,021 Total identifiable net assets $ 100,008 The cash paid for the purchase of EOS exceeded the fair value of the net tangible and identifiable intangible assets acquired as part of the acquisition. As a result, the Company recorded goodwill in connection with the acquisition. Goodwill primarily consists of expected revenue synergies resulting from the combination of product portfolios and cost synergies related to elimination of redundant facilities and functions associated with the combined entity. Goodwill recognized in this transaction is not deductible for tax purposes. The intangible assets acquired will be amortized on a straight-line basis over useful lives of ten years , seven years and ten years for technology-based, customer- related, and trade name related intangible assets, respectively. The estimated fair values of the intangible assets acquired were primarily determined using the income approach based on significant inputs that were not observable in the market . Acquisition costs of $4.8 million and $5.8 million were recognized during the three and six months ended June 30, 2021, respectively, as transaction-related expenses on the condensed consolidated statements of operations as incurred. The Company’s results of operations for the three and six months ended June 30, 2021 included the operating results of EOS since the date of acquisition, of $6.1 million of revenue and net loss of $7.2 million in the condensed consolidated statement of operations. The following table presents the unaudited pro forma results for the three and six months ended June 30, 2021 and 2020, which combines the historical results of operations of the Company and its wholly owned subsidiaries as though the companies had been combined as of January 1, 2020. The pro forma information is presented for informational purposes only and is not indicative of the results of operations that may have been achieved if the acquisition had taken place at such time. The unaudited pro forma results presented include non-recurring adjustments directly attributable to the business combination, including $3.1 million in amortization charges for acquired intangible assets, a $2.0 million adjustment related to the increased fair value of acquired inventory and $14.1 million in acquisition related expenses. The unaudited pro forma results include IFRS to U.S. GAAP adjustments for EOS historical results and adjustments for accounting policy alignment, which were materially similar to the Company. Any differences in accounting policies were adjusted to reflect the accounting policies of the Company in the unaudited pro forma results presented. Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share amounts) 2021 2020 2021 2020 Total revenue $ 64,077 $ 36,314 $ 115,064 $ 70,525 Net loss (40,016 ) (20,711 ) (61,215 ) (58,726 ) Net loss per share, basic and diluted $ (0.41 ) $ (0.33 ) $ (0.66 ) $ (0.93 )

Select Condensed Consolidated B

Select Condensed Consolidated Balance Sheets Details	6 Months Ended
	Jun. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Select Condensed Consolidated Balance Sheets Details	4. Select Condensed Consolidated Balance Sheets Details Accounts Receivable, net Accounts receivable, net consist of the following (in thousands): June 30, 2021 December 31, 2020 Accounts receivable $ 34,064 $ 23,887 Allowance for doubtful accounts (321 ) (360 ) Accounts receivable, net $ 33,743 $ 23,527 Inventories, net Inventories, net consist of the following (in thousands): June 30, 2021 December 31, 2020 Raw materials $ 10,439 $ 6,064 Work-in-process 2,333 1,982 Finished goods 107,360 67,892 120,132 75,938 Less reserve for excess and obsolete finished goods (33,417 ) (29,937 ) Inventories, net $ 86,715 $ 46,001 Property and Equipment, net Property and equipment, net consist of the following (in thousands, except as indicated): Useful lives (in years) June 30, 2021 December 31, 2020 Surgical instruments 4 $ 106,472 $ 76,669 Machinery and equipment 7 9,757 6,562 Computer equipment 3 4,060 4,206 Office furniture and equipment 5 3,219 1,380 Leasehold improvements various 688 1,761 Construction in progress n/a 1,535 2,738 125,731 93,316 Less accumulated depreciation and amortization (59,680 ) (56,646 ) Property and equipment, net $ 66,051 $ 36,670 Total depreciation expense was $5.0 million and $8.4 million for the three and six months ended June 30, 2021, respectively, and $2.2 million and $4.2 million for the three and six months ended June 30, 2020, respectively. Amortization of assets under capital leases is included in depreciation expense. Intangible Assets, net Intangible assets, net consist of the following (in thousands, except as indicated): Remaining Avg. Useful lives (in years) June 30, 2021 December 31, 2020 Developed product technology 10 $ 90,445 $ 35,376 License agreements 1 5,536 5,536 Trademarks and trade names 9 6,692 792 Customer-related 5 16,800 7,458 Distribution network 2 4,027 4,027 In process research and development 7 1,128 1,278 Total gross amount $ 124,628 $ 54,467 Less accumulated amortization (31,647 ) (29,747 ) Intangible assets, net $ 92,981 $ 24,720 During the six months ended June 30, 2021, in connection with the Company’s acquisition of EOS, as further described in Note 3, the Company recorded additions to definite-lived intangible assets and goodwill in the amount of $71.5 million and $31.8 million, respectively. The intangible assets acquired will be amortized on a straight-line basis over weighted-average useful lives of ten years for product technology, nine years for trade name related intangible assets, and five years for customer-related intangible assets. Total amortization expense attributed to intangible assets was $1.5 million and $1.9 million for the three and six months ended June 30, 2021, respectively. The Company recognized a $0.2 million impairment loss related to certain intellectual property within sales, general and administrative expense on its condensed consolidated statement of operations for the six months ended June 30, 2021. In process research and development intangibles begin amortizing when the relevant products reach full commercial launch. Future amortization expense related to intangible assets as of June 30, 2021 is as follows (in thousands): Year Ending December 31, Remainder of 2021 $ 5,330 2022 9,550 2023 9,550 2024 9,447 2025 8,862 Thereafter 50,242 $ 92,981 Accrued Expenses Accrued expenses consist of the following (in thousands): June 30, 2021 December 31, 2020 Commissions and sales milestones $ 11,477 $ 7,038 Payroll and payroll related 13,764 13,552 Litigation settlement obligation - short-term portion 4,000 4,000 Professional fees 2,971 3,551 Royalties 3,406 2,293 Interest 109 619 Administration fees 1,408 442 Accrued manufacturing expense 1,094 — Other 5,226 3,769 Total accrued expenses $ 43,455 $ 35,264 Other Long-Term Liabilities Other long-term liabilities consist of the following (in thousands): June 30, 2021 December 31, 2020 Litigation settlement obligation - long-term portion $ 5,795 $ 7,634 Tax liabilities 3,345 373 Royalties 2,655 1,678 Other 3,348 1,703 Other long-term liabilities $ 15,143 $ 11,388

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2021
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	5. Discontinued Operations In connection with the sale of the previous international distribution business, the Company entered into a product manufacture and supply agreement (the “Supply Agreement”) with Globus, pursuant to which the Company supplies to Globus certain of its implants and instruments, previously offered for sale by the Company in international markets at agreed-upon prices for a minimum term of three years, with the option for Globus to extend the term for up to two additional twelve month periods subject to Globus meeting specified purchase requirements. During the second quarter of 2020, Globus notified the Company that it would exercise the option to extend the agreement for the second additional twelve-month period through August 2021, at which time the Company expects that the Supply Agreement will expire and revenue from Globus will discontinue. In accordance with authoritative guidance, sales to Globus are reported under continuing operations as the Company has continuing involvement under the Supply Agreement. The Company recorded $0.4 million and $0.8 million and in revenue from the Supply Agreement in continuing operations for the three and six months ended June 30, 2021, respectively, and $0.4 million and $0.9 million in cost of revenue from the Supply Agreement in continuing operations for the three and six months ended June 30, 2021, respectively. The Company recorded $0.8 million in both revenue and cost of revenue from the Supply Agreement in continuing operations for the three months ended June 30, 2020 and $1.8 million in both revenue and cost of revenue from the Supply Agreement in continuing operations for the six months ended June 30, 2020.

Debt

Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	6. Debt MidCap Facility Agreement On May 29, 2020, the Company repaid in full all amounts outstanding under the Amended Credit Facility with MidCap Funding IV, LLC (“MidCap”). The Company made a final payment of $9.6 million to MidCap, consisting of outstanding principal and accrued interest. All amounts previously recorded as debt issuance costs were recorded as part of loss on debt extinguishment on the Company’s consolidated statement of operations for the year ended December 31, 2020. Squadron Medical Credit Agreement On November 6, 2018, the Company entered into a term loan with Squadron Medical Finance Solutions, LLC (“Squadron Medical”), a provider of debt financing to growing companies in the orthopedic industry. The term loan was subsequently amended on March 27, 2019, May 29, 2020 and December 16, 2020 to expand the availability of additional term loans, extend the maturity, remove all financial covenant requirements and, in the December 16, 2020 amendment, incorporate a debt exchange. In conjunction with the t erm l oan amendment on December 16, 2020, the Company entered into a debt exchange agreement whereby the Company exchanged $ 30.0 million of the Company’s outstanding debt obligations pursuant to the t erm l oan dated as of November 6, 2018, as amended, for the issuance of 2,700,270 shares of the Company’s Common Stock to Squadron Capital LLC and a participant lender, based on a price of $ 11.11 per share. The debt exchange resulted in additional debt issuance costs of $ 3.8 million , calculated as the difference between the Company’s stock price on the date of issuance and the issuance price. The total principal outstanding under the t erm l oan as of June 3 0 , 202 1 wa s $ million, with an additional $ million in available borrowings. The term loan bears interest at LIBOR plus 8.0% per annum, subject to a 9.0% floor and 12.0% ceiling. Interest-only payments are due monthly until December 2023 and joined by $1.0 million monthly principal payments beginning December 2023. Any remaining principal amounts of the term loan will be due on June 30, 2026. In addition to paying interest on outstanding principal on the term loan, the Company will pay a commitment fee at a rate of 1.0% per annum to Squadron Medical in respect of the available borrowings under the term loan. As collateral for the term loan, Squadron Medical has a first lien security interest in all of the Company’s assets. In connection with the initial 2018 financing, the Company issued warrants to Squadron Medical and a participant lender to purchase 845,000 shares of common stock at an exercise price of $3.15 per share. In conjunction with the first draw under the first amendment of the term loan in 2019, the Company issued warrants to Squadron Medical and the participant lender to purchase an additional 4,838,710 shares of the Company’s common stock at an exercise price of $2.17 per share. In connection with the second amendment of the term loan in May 2020, the Company issued warrants to Squadron Medical and the participant lender to purchase an additional 1,075,820 shares of the Company’s common stock at an exercise price of $4.88 per share. All of the warrants are exercisable immediately and were amended to have the same maturity date in May 2027. Total warrants outstanding to Squadron Medical and the participant lender are 6,759,530 as of June 30, 2021. At issuance, the warrants were valued utilizing the Monte-Carlo simulation model as described further in Note 11 and are recorded as a debt discount. The Company accounted for the March 27, 2019, May 29, 2020, and December 16, 2020 amendments of the term loan as debt modifications with continued amortization of the existing and inclusion of the new debt issuance costs amortized into interest expense utilizing the effective interest rate method. The Company determined that the $30.0 million pre-payment associated with the December 16, 2020 amendment should be accounted for as a partial extinguishment of the November 6, 2018 term loan, as amended. As a result of the partial extinguishment the Company elected as an accounting policy, and in accordance with authoritative guidance set forth by ASC 470-50-40-2, to write off a proportionate amount of the unamortized fees at the time the financing was partially settled in accordance with the terms of the term loan dated November 6, 2018, as amended. The unamortized debt issuance costs are allocated between the remaining original term loan balance and the portion of the term loan paid down on a pro-rata basis. At the time of prepayment, the Company recorded a loss on extinguishment of $6.1 million and capitalized $3.8 million in non-cash debt issuance closing costs. As of June 30, 2021, the debt is recorded at its carrying value of $33.1 million, net of issuance costs of $11.9 million, including all amounts that were paid to third parties to secure the debt and the fair value of the warrants issued. The total debt discount will be amortized into interest expense through the maturity of the debt utilizing the effective interest rate method. Paycheck Protection Loan On April 23, 2020, the Company received the proceeds from a loan in the amount of approximately $4.3 million (the “PPP Loan”) from Silicon Valley Bank, as lender, pursuant to the Paycheck Protection Program (“PPP”) of the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). The PPP Loan matures on April 21, 2022 and bears interest at a rate of 1.0% per annum. Commencing August 21, 2021, the Company is required to pay the lender equal monthly payments of principal and interest and required to fully amortize by April 21, 2022 the principal amount outstanding on the PPP Loan as of the date prescribed by guidance issued by U.S. Small Business Administration (“SBA”). The PPP Loan is evidenced by a promissory note dated April 21, 2020 (the “Note”), which contains customary events of default relating to, among other things, payment defaults and breaches of representations and warranties. The PPP Loan may be prepaid by the Company at any time prior to maturity with no prepayment penalties. All or a portion of the PPP Loan may be forgiven by the SBA upon application. The Company submitted its application for forgiveness of the loan in November 2020, which was still under review by the SBA as of June 30, 2021. Under the CARES Act, loan forgiveness is available for the sum of documented payroll costs, covered rent payments, covered mortgage interest and covered utilities during the twenty-four-week period, beginning on the date of the loan approval. For purposes of the CARES Act, payroll costs exclude compensation of an individual employee in excess of $100,000, prorated annually. Not more than 25% of the forgiven amount may be for non-payroll costs. Forgiveness is reduced if full-time headcount declines, or if salaries and wages for employees with salaries of $100,000 or less annually are reduced by more than 25%. In the event the PPP Loan, or any portion thereof, is forgiven pursuant to the PPP, the amount forgiven is applied to outstanding principal. The Company used all of the proceeds from the PPP Loan to retain employees and maintain payroll. Although the Company has applied for loan forgiveness as afforded by the PPP, no assurance can be provided that such loan forgiveness will be granted in whole or in part. As of June 3 0 , 2021 , $ million of the PPP Loan w as recorded as short -term debt on the Company’s condensed consolidated balance sheet. Inventory Financing In November 2018, the Company entered into an Inventory Financing Agreement with a key inventory and instrument components supplier whereby the Company was originally permitted to draw up to $3.0 million for the purchase of inventory. In November 2020 and May 2021, the Company amended the Inventory Financing Agreement with the supplier to increase the available draw to $6.0 million and then to the current availability of $9.0 million for the purchase of inventory to accrue interest at a rate of LIBOR plus 8.0% subject to a 9.0% floor and 12.0% ceiling. All principal will become due and payable upon maturity on November 6, 2023 and all interest will be paid monthly. The outstanding obligation under the Inventory Financing Agreement as of June 30, 2021 was $7.5 million. OCEANE Convertible Bonds On May 31, 2018, EOS issued 4,344,651 OCEANE convertible bonds due May 2023 for aggregate gross proceeds of €29.5 million or $34.3 million. The OCEANEs are unsecured obligations of EOS, rank equally with all other unsecured and unsubordinated obligations of EOS, and pay interest at a rate equal to 6% per year, payable semiannually in arrears on May 31 and November 30 of each year, beginning November 30, 2018. Unless either earlier converted or repurchased, the OCEANEs will mature on May 31, 2023. Interest expense since the date of the EOS acquisition was $0.1 million for the three and six months ended June 30, 2021. The OCEANEs are convertible by their holders into new EOS Shares or exchangeable for existing EOS Shares, at the Company’s option, at an initial conversion rate of one share per OCEANE, and the initial conversion rate is subject to customary anti-dilution adjustments. The OCEANEs are convertible at any time until the seventh business day prior to maturity or seventh business day prior to an earlier redemption of the OCEANE. If the number of shares calculated is not a whole number, the holder may request allocation of either the whole number of shares immediately below the number, and receive an amount in cash equal to the remaining fractional share value, or the whole number of shares immediately above the number, and pay an amount in cash equal to the remaining fractional share value. Holders of the OCEANEs have the option to convert all or any portion of such OCEANEs, regardless of any conditions, at any time until the close of seventh business day immediately preceding the maturity date. EOS has a right to redeem all of the OCEANEs at its option any time after June 20, 2021 at a cash redemption price equal to the par value of the OCEANEs plus accrued and unpaid interest if the product of the volume-weighted-average price of the shares and the conversion ratio as specified in the agreement in effect on each trading day exceeds 150% of the par value of each OCEANE on each of at least twenty consecutive trading days during any forty consecutive trading days, if EOS redeems the OCEANEs when the number of OCEANEs outstanding is 15% or less of the number of OCEANEs originally issued, or the occurrence of a tender or exchange offer. OCEANE holders can redeem the notes upon the occurrence of an event of default or upon the occurrence of a change of control If EOS undergoes a merger or demerger, the OCEANEs will be convertible into shares of the merged or new company or the beneficiary of such demerger. On May 13, 2021, EOS was acquired by the Company via a tender offer. The Company owned 100% of EOS and 57% of the OCEANEs as of June 30, 2021. Although the acquisition of EOS constituted a change of control, the holders of the OCEANEs did not redeem or convert the OCEANEs. Therefore, the Company continued to classify the OCEANEs as long-term debt on its condensed consolidated balance sheet as of June 30, 2021. The carrying value of the outstanding OCEANEs of $15.1 million (or €12.6 million) approximated the fair value as of June 30, 2021 . Other Debt Agreements In January and April 2021, prior to the acquisition, EOS obtained two loan agreements under French state sponsored COVID relief initiatives Reference Rate Reform In July 2017, the U.K.’s Financial Conduct Authority (“FCA”), which regulates LIBOR, announced that it intends to phase out LIBOR by the end of 2021. On November 30, 2020, ICE Benchmark Administration (the “IBA”), with the support of the United States Federal Reserve and the FCA, announced plans to consult on ceasing publication of USD LIBOR on December 31, 2021 for only the one week and two-month USD LIBOR tenors, and on June 30, 2023 for all other USD LIBOR tenors. Various central bank committees and working groups continue to discuss replacement of benchmark rates, the process for amending existing LIBOR-based contracts, and the potential economic impacts of different alternatives. The Alternative Reference Rates Committee has identified the Secured Overnight Financing Rate (“SOFR”), as its preferred alternative rate for USD LIBOR. SOFR is a measure of the cost of borrowing cash overnight, collateralized by U.S. Treasury securities, and is based on directly observable U.S. Treasury-backed repurchase transactions. The Company is evaluating the potential impact of the replacement of the LIBOR benchmark interest rate including risk management, internal operational readiness and monitoring the FASB’s standard-setting process to address financial reporting issues that might arise in connection with the transition from LIBOR to a new benchmark rate. Principal payments remaining on the Company's debt are as follows as of June 30, 2021 (in thousands): Remainder of 2021 $ 3,184 2022 7,816 2023 23,652 2024 12,018 2025 12,000 Thereafter 20,000 Total 78,670 Less: unamortized debt discount and debt issuance costs (11,893 ) Total 66,777 Less: short-term debt (10,988 ) Long-term debt $ 55,789

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies Leases The Company determines if an arrangement is a lease at inception by assessing whether there is an identified asset and whether the contract conveys the right to control the use of the identified asset in exchange for consideration over a period of time. The Company recognizes right-of-use assets (“ROU assets”) and lease liabilities for office buildings and certain equipment with lease terms of 1 year to 10 years, some of which include options to extend and/or terminate the leases. Any short-term leases defined as twelve months or less or month-to-month leases were excluded and continue to be expensed each month. Total costs associated with these short-term leases is immaterial to all periods presented. The Company aggregates all lease and non-lease components for each class of underlying assets into a single lease component and variable charges for common area maintenance and other variable costs are recognized as expense as incurred. Total variable costs associated with leases for the three and six months ended June 30, 2021 were immaterial. The Company had an immaterial amount of financing leases as of June 30, 2021. Operating Lease The Company occupies approximately 121,541 square feet of office, engineering, and research and development space in Carlsbad, California. On December 4, 2019, the Company entered into a new 10-year operating lease that commenced on February 1, 2021 and will terminate on January 31, 2031, subject to two sixty-month options to renew which were not reasonably certain to be exercised. The Company recognized a $21.1 million ROU asset and $21.5 million lease liability on the condensed consolidated balance sheet upon taking control of the premises on the lease commencement date. Base rent under the building lease for the first twelve months of the term will be $0.2 million per month subject to full abatement during months two through ten, and thereafter will increase annually by 3.0% throughout the remainder of the lease. On April 9, 2021, the Company entered into a new 7-year operating lease agreement for a new distribution center which consists of approximately 75,643 square feet of office and warehouse space in Memphis, Tennessee. The term of the new lease commenced on May 1, 2021 and will terminate on May 1, 2028, subject to two thirty-six-month options to renew which were not reasonably certain to be exercised. The Company recognized a $1.7 million ROU asset and lease liability upon taking control of the premises on the lease commencement date. The Company is expected to occupy a proportionate share of the building upon commencement of the lease on May 1, 2021 and is expected to occupy 100 % of the premises beginning in November 2022. Base rent under the new building lease will be commensurate with the C ompany’s proportionate share of occupancy of the new building and will increase annually by 3.0 % throughout the remainder of the lease. Future minimum annual lease payments under such leases are as follows as of June 30, 2021 (in thousands): Remainder of 2021 $ 857 2022 4,340 2023 4,546 2024 4,583 2025 4,617 Thereafter 22,614 Total undiscounted lease payments 41,557 Less: imputed interest (13,367 ) Operating lease liability 28,190 Less: current portion of operating lease liability (2,777 ) Operating lease liability, less current portion $ 25,413 The Company’s weighted-average remaining lease term and weighted-average discount rate as of June 30, 2021 and December 31, 2020 are as follows: June 30, 2021 December 31, 2020 Weighted-average remaining lease term (years) 9.04 0.7 Weighted-average discount rate 8.5 % 10.5 % Information related to the Company’s operating leases is as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Rent expense $ 1,119 $ 331 $ 2,202 $ 658 Cash paid for amounts included in measurement of lease liabilities $ 495 $ 372 $ 875 $ 741 Purchase Commitments The Company entered into a distribution agreement with a third-party provider in January 2020 in which the Company is obligated to certain minimum purchase requirements related to inventory and equipment leases. As of June 30, 2021, the minimum purchase commitment required by the Company under the agreement was to be paid over a three-year With the acquisition of EOS, the company assumed its inventory purchase commitment agreement with a third-party supplier. EOS is obligated to certain minimum purchase commitment requirements through December 2025. As of June 30, 2021, the remaining minimum purchase commitment required by EOS under the agreement was $28.8 million. Litigation The Company is and may become involved in various legal proceedings arising from its business activities. While management is not aware of any litigation matter that in and of itself would have a material adverse impact on the Company’s consolidated results of operations, cash flows or financial position, litigation is inherently unpredictable, and depending on the nature and timing of a proceeding, an unfavorable resolution could materially affect the Company’s future consolidated results of operations, cash flows or financial position in a particular period. The Company assesses contingencies to determine the degree of probability and range of possible loss for potential accrual or disclosure in the Company’s consolidated financial statements. An estimated loss contingency is accrued in the Company’s consolidated financial statements if it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Because litigation is inherently unpredictable and unfavorable resolutions could occur, assessing contingencies is highly subjective and requires judgments about future events. When evaluating contingencies, the Company may be unable to provide a meaningful estimate due to a number of factors, including the procedural status of the matter in question, the presence of complex or novel legal theories, and/or the ongoing discovery and development of information important to the matters. In addition, damage amounts claimed in litigation against the Company may be unsupported, exaggerated or unrelated to reasonably possible outcomes, and as such are not meaningful indicators of the Company’s potential liability. In February 2018, NuVasive, Inc. filed suit against the Company in the United States District Court for the Southern District of California ( NuVasive, Inc. v. Alphatec Holdings, Inc. et al. In March 2018, the Company moved to dismiss NuVasive’s claims of infringement of its design patents for failure to state a cognizable legal claim. In May 2018, the Court ruled that NuVasive failed to state a plausible claim for infringement of the asserted design patents and dismissed those claims with prejudice. The Company filed its answer, affirmative defenses and counterclaims to NuVasive’s remaining claims in May 2018. Also in March 2018, NuVasive moved for a preliminary injunction. In March 2018, the Court denied that motion without prejudice for failure to comply with the Court’s chambers rules. In April 2018, NuVasive again moved for a preliminary injunction. In July 2018, after a hearing on the matter in June 2018, the Court denied that motion on the grounds that NuVasive failed to establish either likelihood of success on the merits or that it would suffer irreparable harm absent injunction. In September 2018, NuVasive filed an Amended Complaint, asserting additional infringement claims of U.S. Patent Nos. 9,924,859, 9,974,531 and 8,187,334. The Company filed its answer, affirmative defenses and counterclaims to these claims in October 2018. Also in October 2018, NuVasive moved to dismiss the Company’s counterclaims that NuVasive intentionally had misled the U.S. Patent and Trademark Office as a means of obtaining certain patents asserted against the Company. In January 2019, the Court denied NuVasive’s motion as to all but one counterclaim, but granted the Company leave to amend that counterclaim to cure dismissal. The Company amended that counterclaim in February 2019 and, that same month, NuVasive again moved to dismiss it. In March 2019, the Court denied NuVasive’s motion. NuVasive filed its Answer to the amended counterclaim in April 2019. In December 2018, the Company filed a petition with the Patent Trial and Appeal Board (“PTAB”) challenging the validity of certain claims of the ’156 and ’334 Patents. In July 2019, PTAB instituted Inter Partes Review of the validity of asserted claims of the two patents at issue and held a hearing on the matter in April 2020. In July 2020, the PTAB ruled that all challenged claims of the ‘156 Patent were valid (not unpatentable) and ruled that several challenged claims of the ‘334 Patent were invalid, while finding that other challenged claims of the ‘334 Patent valid. NuVasive and the Company have both appealed the PTAB’s written decision on the matter. The Company filed its Principal Brief on February 8, 2021. NuVasive filed its Principal Brief on April 21, 2021. The appeals are currently pending before the U.S. Court of Appeals for the Federal Circuit. In January 2020, NuVasive filed a Motion for Partial Summary Judgment of infringement and validity of the ’832, ’780 and ’270 Patents and the Company filed a Motion for Summary Judgment of non-infringement of all asserted claims and of invalidity of the ’832 Patent and for dismissal of NuVasive’s claim for lost profits and its allegations of assignor estoppel. In April 2020, the Court granted NuVasive’s Motion as to the alleged infringement of the ’832 Patent only and denied NuVasive’s Motion in all other respects. Also, in April 2020, the Court granted the Company’s Motion as to dismissal of the allegations of assignor estoppel and denied the Company’s Motion in all other respects. In November 2020, NuVasive filed a Motion to Strike the Company’s Invalidity Contentions concerning the ’156 and ’334 Implant Patents. In April 2021, the Court denied NuVasive’s motion. In January 2021, NuVasive filed a Motion for Partial Summary Judgment of infringement and validity of the ’156 and ’334 Implant Patents and the Company filed a Motion for Summary Judgment of invalidity of those same patents. These motions were argued to the Court on June 29, 2021 and are now pending before the Court. Trial has been set to begin December 6, 2021. The Company believes that the allegations lack merit and intends to vigorously defend all claims asserted. A liability is recorded in the consolidated financial statements if it is believed to be probable that a loss has been incurred and the amount of the loss can be reasonably estimated. It is impossible at this time to assess whether the outcome of this proceeding will have a material adverse effect on the Company’s consolidated results of operations, cash flows or financial position. Therefore, in accordance with authoritative accounting guidance, the Company has not recorded any accrual for a contingent liability associated with this legal proceeding based on its belief that a liability, while possible, is not probable and any range of potential future charge cannot be reasonably estimated at this time. Indemnifications In the normal course of business, the Company enters into agreements under which it occasionally indemnifies third-parties for intellectual property infringement claims or claims arising from breaches of representations or warranties. In addition, from time to time, the Company provides indemnity protection to third-parties for claims relating to past performance arising from undisclosed liabilities, product liabilities, environmental obligations, representations and warranties, and other claims. In these agreements, the scope and amount of remedy, or the period in which claims can be made, may be limited. It is not possible to determine the maximum potential amount of future payments, if any, due under these indemnities due to the conditional nature of the obligations and the unique facts and circumstances involved in each agreement. In October 2017, NuVasive filed a lawsuit in Delaware Chancery Court against Mr. Miles, the Company’s Chairman and CEO, who was a former officer and board member of NuVasive. The Company itself was not initially a named defendant in this lawsuit; however, on June 28, 2018, NuVasive amended its complaint to add the Company as a defendant. On October 12, 2018, the Delaware Court ordered that NuVasive begin advancing legal fees for Mr. Miles’ defense in the lawsuit, as well as Mr. Miles’ legal fees incurred in pursuing advancement of his fees, pursuant to an indemnification agreement between NuVasive and Mr. Miles. As of June 30, 2021, the Company has not recorded any liability on the condensed consolidated balance sheet related to this matter. Royalties The Company has entered into various intellectual property agreements requiring the payment of royalties based on the sale of products that utilize such intellectual property. These royalties primarily relate to products sold by Alphatec Spine and are based on fixed fees or are calculated either as a percentage of net sales or on a per-unit sold basis. Royalties are included on the accompanying condensed consolidated statements of operations as a component of cost of revenue. As of June 30, 2021, the Company is obligated to pay guaranteed minimum royalty payments under these agreements of approximately $3.4 million through 2026 and beyond.

Orthotec Settlement

Orthotec Settlement	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Orthotec Settlement	8. Orthotec Settlement On September 26, 2014, the Company entered into a Settlement and Release Agreement, dated as of August 13, 2014, by and among the Company and its direct subsidiaries, including Alphatec Spine, Inc., Alphatec Holdings International C.V., Scient'x S.A.S. and Surgiview S.A.S.; HealthpointCapital, LLC, HealthpointCapital Partners, L.P., HealthpointCapital Partners II, L.P., John H. Foster and Mortimer Berkowitz III; and Orthotec, LLC and Patrick Bertranou, (the “Settlement Agreement”). Pursuant to the Settlement Agreement, the Company agreed to pay Orthotec, LLC $49.0 million in cash, including initial cash payments totaling $1.75 million, which the Company previously paid in March 2014, and an additional lump sum payment of $15.75 million, which the Company previously paid in April 2014. The Company agreed to pay the remaining $31.5 million in 28 quarterly installments of $1.1 million and one additional quarterly installment of $0.7 million, commencing October 1, 2014. The payments set forth above are guaranteed by Stipulated Judgments held against the Company, HealthpointCapital Partners, L.P., HealthpointCapital Partners II, L.P., HealthpointCapital, LLC, John H. Foster and Mortimer Berkowitz III and, in the event of a default, will be entered and enforced against these entities and/or individuals in that order. In September 2014, the Company and HealthpointCapital entered into an agreement for joint payment of settlement whereby HealthpointCapital has agreed to contribute $5.0 million to the $49.0 million settlement amount. In October 2020, HealthpointCapital began its $5.0 million contribution, which will be in the form of five quarterly payments of varying amounts. The remaining $1.8 million receivable from HealthpointCapital, LLC continues to be classified within stockholders’ equity on the Company’s condensed consolidated balance sheet due to the related party nature with HealthpointCapital affiliates. Payments made by HealthpointCapital are recorded as a reduction to stockholder’s equity. See Note 13 for further information. As of June 30, 2021, the Company has made installment payments in the aggregate of $47.2 million, with a remaining outstanding balance of $10.6 million (including interest). The Company has the right to prepay the amounts due without penalty. In addition, the unpaid balance of the amounts due accrues interest at the rate of 7% per year until the balance is paid in full. The accrued but unpaid interest will be paid in quarterly installments of $1.1 million (or the full amount of the accrued but unpaid interest if less than $1.1 million) following the full payment of the $31.5 million in quarterly installments described above. No additional interest will accrue on the accrued interest. The Settlement Agreement provides for mutual releases of all claims in the Orthotec, LLC v. Surgiview, S.A.S, et al. matter in the Superior Court of California, Los Angeles County and all other related litigation matters involving the Company and its directors and affiliates. A reconciliation of the total net settlement obligation is as follows (in thousands): June 30, 2021 December 31, 2020 Litigation settlement obligation - short-term portion $ 4,000 $ 4,000 Litigation settlement obligation - long-term portion 5,795 7,634 Total 9,795 11,634 Future interest 838 1,199 Total settlement obligation, gross 10,633 12,833 Related party receivable - included in stockholders' equity (1,800 ) (4,000 ) Total settlement obligation, net $ 8,833 $ 8,833

Business Segment and Geographic

Business Segment and Geographic Information	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Business Segment and Geographic Information	9. Business Segment and Geographic Information The Company operates in one segment based upon the Company’s organizational structure, the way in which the operations and investments are managed and evaluated by the chief operating decision maker (“CODM”) as well as the lack of available discrete financial information at a level lower than the consolidated level. The Company shares common, centralized support functions which report directly to the CODM and decision-making regarding the Company’s overall operating performance and allocation of Company resources is assessed on a consolidated basis. Net revenue and property, plant and equipment, net, by geographic region were as follows: Revenue Property and equipment, net Three Months Ended June 30, Six Months Ended June 30, June 30, December 31, (in thousands) 2021 2020 2021 2020 2021 2020 United States $ 59,294 $ 28,834 $ 103,010 $ 57,904 $ 64,729 $ 36,670 International 2,955 795 3,360 1,840 1,322 — Total $ 62,249 $ 29,629 $ 106,370 $ 59,744 $ 66,051 $ 36,670

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Net Loss Per Share	10. Net Loss Per Share Basic net loss per share is calculated by dividing the net income or loss available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted net loss per share attributable to common stockholders is calculated by dividing net loss available to common stockholders by the diluted weighted-average number of common shares outstanding for the period. The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Numerator: Net loss, basic and diluted $ (38,205 ) $ (15,805 ) $ (61,108 ) $ (36,527 ) Denominator: Weighted-average common shares outstanding, basic and diluted 98,541 63,713 92,912 63,140 Net loss per share, basic and diluted: $ (0.39 ) $ (0.25 ) $ (0.66 ) $ (0.58 ) The anti-dilutive securities not included in diluted net As of June 30, 2021 2020 Series A Convertible Preferred Stock 29 67 Options to purchase common stock and employee stock purchase plan 3,659 4,167 Unvested restricted share awards 8,678 8,345 Warrants to purchase common stock 20,525 25,401 Total 32,891 37,980

Stock-Benefit Plans and Equity

Stock-Benefit Plans and Equity Transactions	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Benefit Plans and Equity Transactions	11. Stock-Benefit Plans and Equity Transactions Stock Benefit Plans On June 17, 2020, the Company’s shareholders approved an amendment to the Company’s 2016 Equity Incentive Award Plan (the “2016 Equity Plan”), which increased the amount of shares of common stock available for issuance under the 2016 Equity Plan by 7,000,000 shares. At June 30, 2021, 3,827,639 shares of common stock were available for issuance under the 2016 Equity Incentive Award Plan. In 2007, the Company adopted the Alphatec Holdings, Inc. 2007 Amended and Restated Employee Stock Purchase Plan (the “ESPP”), which first was amended in May 2017. On June 16, 2021, the Company’s shareholders approved a second amendment to the ESPP which increased the amount of shares of common stock available for purchase under the ESPP by 500,000 shares. At June 30, 2021, 662,036 shares of common stock were available for purchase under the ESPP. Stock-Based Compensation Total stock-based compensation for the periods presented were as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Cost of revenues $ 235 $ 128 $ 330 $ 235 Research and development 664 563 1,162 954 Sales, general and administrative 10,597 3,884 14,478 6,954 Total $ 11,496 $ 4,575 $ 15,970 $ 8,143 Shares Reserved for Future Issuance As of June 30, 2021, the Company’s shares of common stock reserved for future issuance were as follows (in thousands): Stock options outstanding 3,616 Unvested restricted stock award 8,678 Employee stock purchase plan 662 Series A convertible preferred stock 29 Warrants outstanding 20,525 Authorized for future grant under the Distributor and Development Services plans 952 Authorized for future grant under the Management Objective Strategic Incentive Plan 345 Authorized for future grant under the Company equity plans 4,496 Total 39,303 Warrants Outstanding 2017 PIPE Warrants The 2017 Common Stock Warrants (the “2017 PIPE Warrants”) have a five-year 2018 PIPE Warrants The 2018 Common Stock Warrants (the “2018 PIPE Warrants”) have a five-year SafeOp Surgical Merger Warrants In conjunction with the Company’s 2018 acquisition of SafeOp, the Company issued warrants to purchase 2,200,000 shares of common stock at an exercise price of $3.50 per share, which have a five-year Squadron Medical Warrants As further described in Note 6, during the year ended December 31, 2018, in connection with the initial debt financing with Squadron Medical and a participant lender, the Company issued warrants to purchase 845,000 shares of common stock at an exercise price of $3.15 per share. An additional 4,838,710 warrants were issued at an exercise price of $2.17 per share during the second quarter of 2019, in conjunction with the Company’s draw on the expanded credit facility. In May 2020, an additional 1,075,820 warrants were issued at an exercise price of $4.88 per share in conjunction with the Company’s second amendment to the Squadron Medical debt for total warrants outstanding to Squadron Medical and the participant lender of 6,759,530. In conjunction with the second amendment, the expiration dates for all existing warrants were extended to May 29, 2027 in order to align all outstanding warrant expiration dates. In accordance with authoritative accounting guidance, the warrants qualified for equity treatment upon issuance and were recorded as a debt discount to the face of the debt liability based on fair value to be amortized into interest expense over the life of the debt agreement. The fair value assigned to the warrant amendment was also allocated as a debt issuance cost and amortized into interest expense. As the warrants provide for partial price protection that allow for a reduction in the price in the event of a lower per share priced issuance, the warrants were valued utilizing a Monte Carlo simulation that considers the probabilities of future financings. The Monte Carlo model simulates the present value of the potential outcomes of future stock prices of the Company over the seven-year life of the warrants. The projection of stock prices is based on the risk-free rate of return and the volatility of the stock price of the Company and correlates future equity raises based on the probabilities provided. No Squadron Medical Warrants have been exercised as of June 30, 2021. Executive Warrants In December 2017 the Company issued warrants to Mr. Patrick S. Miles, the Company’s Chairman and Chief Executive Officer, to purchase 1,327,434 shares of the Company’s common stock for $5.00 per share (the “Executive Warrants”). The warrants have a five-year A summary of all outstanding warrants for common stock as of June 30, 2021 were as follows: Number of Warrants Strike Price Expiration 2017 PIPE Warrants 2,587,000 $ 2.00 June 2022 2018 PIPE Warrants 8,538,569 $ 3.50 May 2023 SafeOp Surgical Merger Warrants 1,194,943 $ 3.50 May 2023 2018 Squadron Medical Warrants 845,000 $ 3.15 May 2027 2019 Squadron Medical Warrants 4,838,710 $ 2.17 May 2027 2020 Squadron Medical Warrants 1,075,820 $ 4.88 May 2027 Executive Warrants 1,327,434 $ 5.00 December 2022 Other ( 1) 117,812 $ 2.87 Various through May 2023 Total 20,525,288 (1) Weighted-average strike price. All outstanding warrants were deemed to qualify for equity classification under authoritative accounting guidance. 2017 Distributor Inducement Plan and 2017 Development Services Plan Under the 2017 Distributor Inducement Plan, the Company is authorized to grant up to 1,000,000 shares of common stock to third-party distributors whereby, upon the achievement of certain Company sales and/or distribution milestones the Company may grant to a distributor shares of common stock or warrants to purchase shares of common stock. The warrants and restricted stock units issued under the plan are subject to time based or net sales-based vesting conditions. As of June 30, 2021, 575,000 warrants and 284,500 shares of restricted common stock have been granted under the 2017 Distributor Inducement Plan. As of June 30, 2021, 195,000 warrants and 84,500 restricted stock units have been earned or issued under the plan. Warrants granted under the plan as of June 30, 2021 were not yet subject to expiration related to any time or sales-based vesting conditions. Under the 2017 Development Services Plan, the Company is authorized to grant up to 7,000,000 shares of common stock to third-party individuals or entities whereby, upon the achievement of certain Company financial and commercial revenue milestones, future royalty payments for product and/or intellectual property development work may be paid in either cash or restricted shares of Company common stock at the election of the developer. Each common stock issuance is subject to net sales-based and other vesting provisions and satisfaction of applicable laws and market regulations regarding the issuance of restricted shares to such developers. The Company has entered into Development Services Agreements pursuant to which the Company has granted 6,709,000 shares of restricted common stock under the 2017 Development Services Plan, subject to achievement of the performance criteria and vesting conditions set forth in such Development Services Agreements. As of June 30, 2021, none of the grants were deemed probable of equity election. 2019 Management Objective Strategic Incentive Plan Under the 2019 Management Objective Strategic Incentive Plan, the Company is authorized to grant up to 500,000 shares of common stock to third-party individuals or entities that do not qualify under the Company’s other existing equity plans, with a maximum grant of 50,000 shares per participant. As of June 30, 2021, 130,000 restricted shares and a warrant to purchase up to 25,000 restricted common stock shares have been granted under the 2019 Management Objective Strategic Incentive Plan.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes To calculate its interim tax provision, at the end of each interim period the Company estimates the annual effective tax rate, adjusted for discrete items arising in that quarter, and applies that rate to its ordinary quarterly earnings. The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in foreign jurisdictions, permanent and temporary differences between book and tax amounts, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained or the tax environment changes. The Company’s effective tax rate from continuing operations was (.11%) percent and (.12%) percent for the three and six months ended June 30, 2021, respectively, and (.38%) percent and (.27%) percent for the three and six months ended June 30, 2020, respectively. The Company’s effective tax rate differs from the federal statutory rate of 21 % in each period primarily due to the Company’s net loss position and valuation allowance.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	13. Related Party Transactions In July 2016, the Company entered into a forbearance agreement with HealthpointCapital, LLC, HealthpointCapital Partners, L.P., and HealthpointCapital Partners II, L.P. (collectively, "HealthpointCapital"), pursuant to which HealthpointCapital, on behalf of the Company, paid $1.0 million of the $1.1 million payment due and payable by the Company to Orthotec on July 1, 2016 and agreed to not exercise its contractual rights to seek an immediate repayment of such amount. Pursuant to this forbearance agreement, the Company repaid this amount in September 2016. The Company and HealthpointCapital also entered into an agreement for joint payment of settlement whereby HealthpointCapital has agreed to contribute $5.0 million to the $49.0 million Orthotec settlement amount. In October 2020, began making its $5.0 million contribution, which will be in the form of quarterly payments. During the second quarter of 2018, HealthpointCapital Partners, L.P., and HealthpointCapital Partners II, L.P. distributed its holdings in the Company’s common stock to its limited partners. As a result, the fund is no longer a shareholder of the Company as of June 30, 2021 classified within stockholders’ equity on the Company’s condensed consolidated balance sheet due to the related party nature with HealthpointCapital affiliates. Payments made by HealthpointCapital will be recorded as a reduction to stockholder’s equity. In November 2018, the Company entered into a Term Loan and Financing agreement with affiliates of Squadron Capital, LLC. The Term Loan was amended in March 2019, May 2020 and December 2020, as further described in Note 6. Squadron Capital, LLC was a lead investor in the private placement of shares of the Company’s common stock that was closed on March 1, 2021. David Pelizzon, President and Director of Squadron Capital, LLC, currently serves on the Company’s Board of Directors. Included on the condensed consolidated balance sheet as of June 30, 2021 is a $1.1 million officer receivable for settlement of a tax liability related to the vesting of restricted common stock. A corresponding liability for the same amount is also included within accrued expenses on the condensed consolidated balance sheet.

Subsequent Event

Subsequent Event	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Event	14. Subsequent Event In July 2021, the Company received confirmation from the SBA that the entire PPP Loan was forgiven. See Note 6 for further information on the PPP Loan.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Revenue Recognition	Revenue Recognition The Company recognizes revenue from products sales in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“Topic 606”). This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaboration arrangements and financial instruments. Under Topic 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of Topic 606, the entity performs the following five steps: ( i ) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The Company only applies the five-step model to contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. Sales are derived primarily from the sale of spinal implant products to hospitals and medical centers through direct sales representatives and independent distributor agents, and now includes imaging equipment and related services with the acquisition of EOS. Revenue is recognized when obligations under the terms of a contract with customers are satisfied, which occurs with the transfer of control of products to customers, either upon shipment of the product or delivery of the product to the customer depending on the shipping terms, or when the products are used in a surgical procedure (implanted in a patient). Revenue from the sale of imaging equipment is recognized as each distinct performance obligation is fulfilled and control transfers to the customer, beginning with shipment or delivery, depending on the terms. Revenue from other distinct performance obligations, such as maintenance on imaging equipment, training services, and other imaging related services, is recognized in the period the service is performed, and makes up less than 10% of the Company’s total revenue. Revenue is measured based on the amount of consideration expected to be received in exchange for the transfer of the goods or services specified in the contract with each customer. In certain cases, the Company does offer the ability for customers to lease its imaging equipment primarily on a non-sales type basis, but such arrangements are immaterial to total revenue in the periods presented. The Company generally does not allow returns of products that have been delivered and will recognize such revenue when the Company concludes there is not a risk of significant revenue reversal in future periods for the expected consideration in the transaction. Costs incurred by the Company associated with sales contracts with customers are deferred over the performance obligation period and recognized in the same period as the related revenue, with the exception of contracts that complete within one year or less, in which case the associated costs are expensed as incurred. Payment terms for sales to customers may vary but are commensurate with the general business practices in the country of sale. To the extent that the transaction price includes variable consideration, such as discounts, rebates, and customer payment penalties, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method depending on the nature of the variable consideration. Variable consideration is included in the transaction price if, in the Company’s judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of our anticipated performance and all information that is reasonably available, including historical, current, and forecasted information. The Company records a contract liability, or deferred revenue, when it has an obligation to provide a product or service to the customer and payment is received or due in advance of its performance. When the Company sells a product or service with a future performance obligation, revenue is deferred on the unfulfilled performance obligation and recognized over the related performance period. Generally, the Company does not have observable evidence of the standalone selling price related to its future service obligations; therefore, the Company estimates the selling price using an expected cost plus a margin approach. The transaction price is allocated using the relative standalone selling price method. The use of alternative estimates could result in a different amount of revenue deferral. The Company recognized $3.4 million of revenue from its contract liabilities during the three and six months ended June 30, 2021. The opening and closing balances of the Company’s contract liability are as follows: Balance at January 1, 2021 $ — Contract liability assumed from EOS 21,196 Payments received 2,586 Revenue recognized (3,390 ) Balance at June 30, 2021 $ 20,392
Fair Value Measurements	Fair Value Measurements T he carrying amount of financial instruments consisting of cash, accounts receivable, prepaid expenses and other current assets, accounts payable, accrued expenses, and short-term debt included in the Company’s condensed consolidated financial statements are reasonable estimates of fair value due to their short maturities. Based on the borrowing rates currently available to the Company for loans with similar terms, management believes the fair value of long-term debt approximates its carrying value. Authoritative guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1: Quoted prices in active markets for identical assets or liabilities. Level 2: Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active; or other inputs that can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The following table presents information related to the Company’s liabilities measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 (in thousands): June 30, 2021 Liabilities: Level 1 Level 2 Level 3 Total Liability classified equity award (1) $ — — 4,404 $ 4,404 Foreign currency forward contract — 151 — 151 Total $ — 151 4,404 $ 4,555 December 31, 2020 Liabilities: Level 1 Level 2 Level 3 Total Liability classified equity award (1) $ — — 4,108 $ 4,108 Foreign currency forward contract — 878 — 878 Total $ — 878 4,108 $ 4,986 (1) A portion of this award is being accreted over the requisite service period. The Company did not have any transfers of assets and liabilities between the levels of the fair value measurement hierarchy during the periods presented. On March 16, 2021, the Company entered into two foreign currency forward contracts, with a notional amount of $8.0 million total ($4.0 million each) or €6.7 million total (€3.3 million each) to mitigate the foreign currency exchange risk related to its EOS subsidiary. The contracts are not designated as hedging instruments. The Company classified the derivative liabilities within Level 2 of the fair value hierarchy as observable inputs are available for the full term of the derivative instruments. The fair value of the forward contracts was developed using a market approach based on publicly available market yield curves and the term of the contracts. The Company recognized a nominal loss from the change in fair value of the contracts during the six months ended June 30, 2021. The loss on the change in fair value of the contracts was recorded as other expense on the condensed consolidated statement of operations. On December 18, 2020, the Company entered into a foreign currency forward contract, with a notional amount of $117.9 million (€95.6 million) to mitigate the foreign currency exchange risk related to the Tender Offer Agreement, denominated in Euros ("EUR"). The contract is not designated as a hedging instrument. The Company classified the derivative liability within Level 2 of the fair value hierarchy as observable inputs are available for the full term of the derivative instrument. The fair value of the forward contract was developed using a market approach based on publicly available market yield curves and the term of the contract. On March 2, 2021, the foreign currency forward contract was settled for €95.6 million ($115.3 million). The Company recognized a $1.7 million loss from the change in fair value of the contract during the six months ended June 30, 2021. The loss on the contract settlement was recorded as other expense on the condensed consolidated statement of operations and the cash settlement is included in investing activities in the condensed consolidated statement of cash flows for the six months ended June 30, 2021. During the second quarter of 2019, the Company issued a liability classified equity award to one of its executive officers. The award will be earned over a 4-year vesting period and upon a specific market condition. As the award will be settled in cash, it is classified as a liability within Level 3 of the fair value hierarchy as the Company is using a probability-weighted income approach, utilizing significant unobservable inputs including the probability of achieving the specified market condition with the valuation updated at each reporting period. The full fair value of the cash settled award was $ million as of June 30, 2021 and is being recognized ratably as the underlying service period is provided. The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2021 (in thousands): Level 3 Liabilities Balance at January 1, 2021 $ 1,668 Vested portion of liability classified equity award 258 Change in fair value measurement 199 Balance at March 31, 2021 $ 2,125 Vested portion of liability classified equity award 283 Change in fair value measurement (68 ) Balance at June 30, 2021 $ 2,340
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In August 2020, the FASB issued Accounting Standard Update (“ASU”) No. 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging-Contracts in Entity’s Own Equity (Subtopic 815-40) (“ ”) In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848) Recently Issued Accounting Pronouncements In May 2021, the FASB issued ASU No. 2021-04, Earnings Per Share (Topic 260), Debt—Modifications and Extinguishments (Subtopic 470-50), Compensation—Stock Compensation (Topic 718), and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Opening and Closing Balances of Company's Contract Liability	The opening and closing balances of the Company’s contract liability are as follows: Balance at January 1, 2021 $ — Contract liability assumed from EOS 21,196 Payments received 2,586 Revenue recognized (3,390 ) Balance at June 30, 2021 $ 20,392
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents information related to the Company’s liabilities measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 (in thousands): June 30, 2021 Liabilities: Level 1 Level 2 Level 3 Total Liability classified equity award (1) $ — — 4,404 $ 4,404 Foreign currency forward contract — 151 — 151 Total $ — 151 4,404 $ 4,555 December 31, 2020 Liabilities: Level 1 Level 2 Level 3 Total Liability classified equity award (1) $ — — 4,108 $ 4,108 Foreign currency forward contract — 878 — 878 Total $ — 878 4,108 $ 4,986 (1) A portion of this award is being accreted over the requisite service period.
Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs	The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2021 (in thousands): Level 3 Liabilities Balance at January 1, 2021 $ 1,668 Vested portion of liability classified equity award 258 Change in fair value measurement 199 Balance at March 31, 2021 $ 2,125 Vested portion of liability classified equity award 283 Change in fair value measurement (68 ) Balance at June 30, 2021 $ 2,340

Business Combination (Tables)

Business Combination (Tables)	6 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Schedule of Allocation of Purchase Price to Assets Acquired and Liabilities Assumed Based on Fair Values	The allocation of the purchase price to the assets acquired and liabilities assumed based on their fair values were as follows: (in thousands) As of May 13, 2021 Cash paid for purchase of EOS Shares in Initial Offer Period $ 46,908 Cash paid for purchase of OCEANEs in Initial Offer Period 19,620 Total cash paid in Initial Offer Period 66,528 Fair value of investment in EOS Shares held before the Initial Offer Period 23,549 Fair value of investment in OCEANEs held before the Initial Offer Period 1,477 Total fair value of investment in EOS held before the Initial Offer Period 25,026 Fair value of noncontrolling interest acquired subsequent to Initial Offer Period 8,454 $ 100,008 Cash and cash equivalents $ 16,778 Accounts receivable 9,083 Inventory 26,531 Other current assets 4,422 Property, plant and equipment, net 1,650 Right-of-use asset 4,341 Goodwill 31,822 Definite-lived intangible assets: Developed technology 56,000 Customer relationships 9,500 Trade names 6,000 Other noncurrent assets 395 Contract liabilities 21,196 Long-term debt 15,297 Other liabilities assumed 30,021 Total identifiable net assets $ 100,008
Schedule of Unaudited Pro Forma Results	The unaudited pro forma results include IFRS to U.S. GAAP adjustments for EOS historical results and adjustments for accounting policy alignment, which were materially similar to the Company. Any differences in accounting policies were adjusted to reflect the accounting policies of the Company in the unaudited pro forma results presented. Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share amounts) 2021 2020 2021 2020 Total revenue $ 64,077 $ 36,314 $ 115,064 $ 70,525 Net loss (40,016 ) (20,711 ) (61,215 ) (58,726 ) Net loss per share, basic and diluted $ (0.41 ) $ (0.33 ) $ (0.66 ) $ (0.93 )

Select Condensed Consolidated_2

Select Condensed Consolidated Balance Sheets Details (Tables)	6 Months Ended
	Jun. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Accounts receivable, net	Accounts receivable, net consist of the following (in thousands): June 30, 2021 December 31, 2020 Accounts receivable $ 34,064 $ 23,887 Allowance for doubtful accounts (321 ) (360 ) Accounts receivable, net $ 33,743 $ 23,527
Inventories, net	Inventories, net consist of the following (in thousands): June 30, 2021 December 31, 2020 Raw materials $ 10,439 $ 6,064 Work-in-process 2,333 1,982 Finished goods 107,360 67,892 120,132 75,938 Less reserve for excess and obsolete finished goods (33,417 ) (29,937 ) Inventories, net $ 86,715 $ 46,001
Property and equipment, net	Property and equipment, net consist of the following (in thousands, except as indicated): Useful lives (in years) June 30, 2021 December 31, 2020 Surgical instruments 4 $ 106,472 $ 76,669 Machinery and equipment 7 9,757 6,562 Computer equipment 3 4,060 4,206 Office furniture and equipment 5 3,219 1,380 Leasehold improvements various 688 1,761 Construction in progress n/a 1,535 2,738 125,731 93,316 Less accumulated depreciation and amortization (59,680 ) (56,646 ) Property and equipment, net $ 66,051 $ 36,670
Intangible assets, net	Intangible assets, net consist of the following (in thousands, except as indicated): Remaining Avg. Useful lives (in years) June 30, 2021 December 31, 2020 Developed product technology 10 $ 90,445 $ 35,376 License agreements 1 5,536 5,536 Trademarks and trade names 9 6,692 792 Customer-related 5 16,800 7,458 Distribution network 2 4,027 4,027 In process research and development 7 1,128 1,278 Total gross amount $ 124,628 $ 54,467 Less accumulated amortization (31,647 ) (29,747 ) Intangible assets, net $ 92,981 $ 24,720
Schedule of intangible assets, future expected amortization expense	Future amortization expense related to intangible assets as of June 30, 2021 is as follows (in thousands) Year Ending December 31, Remainder of 2021 $ 5,330 2022 9,550 2023 9,550 2024 9,447 2025 8,862 Thereafter 50,242 $ 92,981
Accrued expenses	Accrued expenses consist of the following (in thousands): June 30, 2021 December 31, 2020 Commissions and sales milestones $ 11,477 $ 7,038 Payroll and payroll related 13,764 13,552 Litigation settlement obligation - short-term portion 4,000 4,000 Professional fees 2,971 3,551 Royalties 3,406 2,293 Interest 109 619 Administration fees 1,408 442 Accrued manufacturing expense 1,094 — Other 5,226 3,769 Total accrued expenses $ 43,455 $ 35,264
Schedule of Other Long-Term Liabilities	Other long-term liabilities consist of the following (in thousands): June 30, 2021 December 31, 2020 Litigation settlement obligation - long-term portion $ 5,795 $ 7,634 Tax liabilities 3,345 373 Royalties 2,655 1,678 Other 3,348 1,703 Other long-term liabilities $ 15,143 $ 11,388

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Principal Payments on Debt	Principal payments remaining on the Company's debt are as follows as of June 30, 2021 (in thousands): Remainder of 2021 $ 3,184 2022 7,816 2023 23,652 2024 12,018 2025 12,000 Thereafter 20,000 Total 78,670 Less: unamortized debt discount and debt issuance costs (11,893 ) Total 66,777 Less: short-term debt (10,988 ) Long-term debt $ 55,789

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Future minimum annual lease payments	Future minimum annual lease payments under such leases are as follows as of June 30, 2021 (in thousands): Remainder of 2021 $ 857 2022 4,340 2023 4,546 2024 4,583 2025 4,617 Thereafter 22,614 Total undiscounted lease payments 41,557 Less: imputed interest (13,367 ) Operating lease liability 28,190 Less: current portion of operating lease liability (2,777 ) Operating lease liability, less current portion $ 25,413
Summary of Weighted-Average Remaining Lease Term and Discount Rate	The Company’s weighted-average remaining lease term and weighted-average discount rate as of June 30, 2021 and December 31, 2020 are as follows: June 30, 2021 December 31, 2020 Weighted-average remaining lease term (years) 9.04 0.7 Weighted-average discount rate 8.5 % 10.5 %
Summary of Operating Leases	Information related to the Company’s operating leases is as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Rent expense $ 1,119 $ 331 $ 2,202 $ 658 Cash paid for amounts included in measurement of lease liabilities $ 495 $ 372 $ 875 $ 741

Orthotec Settlement (Tables)

Orthotec Settlement (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Schedule of Reconciliation of Total Net Settlement Obligation	A reconciliation of the total net settlement obligation is as follows (in thousands): June 30, 2021 December 31, 2020 Litigation settlement obligation - short-term portion $ 4,000 $ 4,000 Litigation settlement obligation - long-term portion 5,795 7,634 Total 9,795 11,634 Future interest 838 1,199 Total settlement obligation, gross 10,633 12,833 Related party receivable - included in stockholders' equity (1,800 ) (4,000 ) Total settlement obligation, net $ 8,833 $ 8,833

Business Segment and Geograph_2

Business Segment and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Net Revenue and Property, Plant and Equipment, Net, by Geographic Region	Net revenue and property, plant and equipment, net, by geographic region were as follows: Revenue Property and equipment, net Three Months Ended June 30, Six Months Ended June 30, June 30, December 31, (in thousands) 2021 2020 2021 2020 2021 2020 United States $ 59,294 $ 28,834 $ 103,010 $ 57,904 $ 64,729 $ 36,670 International 2,955 795 3,360 1,840 1,322 — Total $ 62,249 $ 29,629 $ 106,370 $ 59,744 $ 66,051 $ 36,670

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Share	The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Numerator: Net loss, basic and diluted $ (38,205 ) $ (15,805 ) $ (61,108 ) $ (36,527 ) Denominator: Weighted-average common shares outstanding, basic and diluted 98,541 63,713 92,912 63,140 Net loss per share, basic and diluted: $ (0.39 ) $ (0.25 ) $ (0.66 ) $ (0.58 )
Anti-Dilutive Securities Not Included in Diluted Net Loss Per Share	The anti-dilutive securities not included in diluted net As of June 30, 2021 2020 Series A Convertible Preferred Stock 29 67 Options to purchase common stock and employee stock purchase plan 3,659 4,167 Unvested restricted share awards 8,678 8,345 Warrants to purchase common stock 20,525 25,401 Total 32,891 37,980

Stock-Benefit Plans and Equit_2

Stock-Benefit Plans and Equity Transactions (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Total Stock Based Compensation	Stock-Based Compensation Total stock-based compensation for the periods presented were as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Cost of revenues $ 235 $ 128 $ 330 $ 235 Research and development 664 563 1,162 954 Sales, general and administrative 10,597 3,884 14,478 6,954 Total $ 11,496 $ 4,575 $ 15,970 $ 8,143
Summary of Common Stock Reserved for Future Issuance	As of June 30, 2021, the Company’s shares of common stock reserved for future issuance were as follows (in thousands): Stock options outstanding 3,616 Unvested restricted stock award 8,678 Employee stock purchase plan 662 Series A convertible preferred stock 29 Warrants outstanding 20,525 Authorized for future grant under the Distributor and Development Services plans 952 Authorized for future grant under the Management Objective Strategic Incentive Plan 345 Authorized for future grant under the Company equity plans 4,496 Total 39,303
Summary of All Outstanding Warrants for Common Stock	A summary of all outstanding warrants for common stock as of June 30, 2021 were as follows: Number of Warrants Strike Price Expiration 2017 PIPE Warrants 2,587,000 $ 2.00 June 2022 2018 PIPE Warrants 8,538,569 $ 3.50 May 2023 SafeOp Surgical Merger Warrants 1,194,943 $ 3.50 May 2023 2018 Squadron Medical Warrants 845,000 $ 3.15 May 2027 2019 Squadron Medical Warrants 4,838,710 $ 2.17 May 2027 2020 Squadron Medical Warrants 1,075,820 $ 4.88 May 2027 Executive Warrants 1,327,434 $ 5.00 December 2022 Other ( 1) 117,812 $ 2.87 Various through May 2023 Total 20,525,288 (1) Weighted-average strike price.

The Company and Basis of Pres_2

The Company and Basis of Presentation - Additional Information (Details)	May 13, 2021
Tender Offer Agreement | EOS Imaging S.A.
Company And Basis Of Presentation [Line Items]
Percentage of interest acquired	100.00%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands, € in Millions	Mar. 02, 2021USD ($)	Mar. 02, 2021EUR (€)	Jun. 30, 2021USD ($)	Jun. 30, 2021USD ($)	Mar. 16, 2021USD ($)Contract	Mar. 16, 2021EUR (€)Contract	Dec. 18, 2020USD ($)	Dec. 18, 2020EUR (€)
Significant Accounting Policies [Line Items]
Revenue from contract liabilities			$ 3,400	$ 3,390
ASU No. 2020-06
Significant Accounting Policies [Line Items]
Change in accounting principle accounting standards update adopted [true false]			true	true
Change in accounting principle accounting standards update adoption date			Jan. 1, 2021	Jan. 1, 2021
Change in accounting principle accounting standards update immaterial effect [true false]			true	true
ASU No. 2021-01
Significant Accounting Policies [Line Items]
Change in accounting principle accounting standards update adopted [true false]			true	true
Change in accounting principle accounting standards update immaterial effect [true false]			true	true
Fair value, inputs, level 2
Significant Accounting Policies [Line Items]
Number of foreign currency forward contracts entered | Contract					2	2
Notional amount of foreign currency forward contracts					$ 8,000	€ 6.7	$ 117,900	€ 95.6
Notional amount of each foreign currency forward contract					$ 4,000	€ 3.3
Foreign currency forward contract settled	$ 115,300	€ 95.6
Foreign currency forward contract loss recognized				$ 1,700
Fair value, inputs, level 3
Significant Accounting Policies [Line Items]
Vesting period				4 years
Fair value of the cash settled award			$ 4,400	$ 4,400
Maximum
Significant Accounting Policies [Line Items]
Percentage of revenue from other distinct performance obligations of total revenue				10.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Opening and Closing Balances of Company's Contract Liability (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Accounting Policies [Abstract]
Contract liability assumed from EOS		$ 21,196
Payments received		2,586
Revenue recognized	$ (3,400)	(3,390)
Balance at June 30, 2021	$ 20,392	$ 20,392

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 4,555	$ 4,986
Liability Classified Equity Award
Liabilities:
Liabilities measured at fair value on a recurring basis	4,404	4,108
Foreign Currency Forward Contract
Liabilities:
Liabilities measured at fair value on a recurring basis	151	878
Level 2
Liabilities:
Liabilities measured at fair value on a recurring basis	151	878
Level 2 | Foreign Currency Forward Contract
Liabilities:
Liabilities measured at fair value on a recurring basis	151	878
Level 3
Liabilities:
Liabilities measured at fair value on a recurring basis	4,404	4,108
Level 3 | Liability Classified Equity Award
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 4,404	$ 4,108

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Details) - Fair value, inputs, level 3 - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 2,125	$ 1,668
Vested portion of liability classified equity award	283	258
Change in fair value measurement	(68)	199
Ending balance	$ 2,340	$ 2,125

Business Combination - Addition

Business Combination - Additional Information (Details) $ in Thousands	Jun. 02, 2021USD ($)	May 17, 2021USD ($)	May 13, 2021USD ($)	May 12, 2021USD ($)	Jun. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 16, 2020€ / shares
Business Acquisition [Line Items]
Transaction-related expenses					$ 4,771		$ (181)		$ 5,783	$ 4,091
Net loss					(38,205)	$ (22,903)	(15,805)	$ (20,722)	(61,108)	(36,527)
Amortization of acquired intangible assets					$ 1,208		$ 172		$ 1,380	$ 344
EOS Imaging S.A.
Business Acquisition [Line Items]
Business acquisition ownership percentage acquired					100.00%				100.00%
Purchase price			$ 100,008
Purchase price in cash			66,528
Transaction-related expenses									$ 14,100
Revenue					$ 6,100				6,100
Net loss					(7,200)				(7,200)
Amortization of acquired intangible assets									3,100
Adjustment related to increased fair value of acquired inventory									2,000
EOS Imaging S.A. | Transaction Related Expenses
Business Acquisition [Line Items]
Transaction-related expenses					$ 4,800				$ 5,800
EOS Imaging S.A. | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired amortized on a straight-line basis over useful lives									10 years
EOS Imaging S.A. | Trade Name Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired amortized on a straight-line basis over useful lives									10 years
EOS Imaging S.A. | Customer Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired amortized on a straight-line basis over useful lives									7 years
EOS Imaging S.A. | EOS Share
Business Acquisition [Line Items]
Purchase price in cash			46,908
EOS Imaging S.A. | OCEANEs
Business Acquisition [Line Items]
Purchase price in cash			19,620
Tender Offer Agreement | EOS Imaging S.A.
Business Acquisition [Line Items]
Share price | € / shares											€ 0.01
Purchase price	$ 100,000	$ 8,500	$ 66,500
Purchase price in cash				$ 25,000
Ownership percentage on share capital and voting rights			80.00%
Tender Offer Agreement | EOS Imaging S.A. | EOS Share
Business Acquisition [Line Items]
Tender offer price | € / shares											2.45
Business acquisition ownership percentage acquired	100.00%		59.00%
Ownership percentage on share capital prior to initial offer period				30.00%
Ownership percentage on share capital after initial offer period			89.00%
Tender Offer Agreement | EOS Imaging S.A. | OCEANEs
Business Acquisition [Line Items]
Tender offer price | € / shares											€ 7.01
Business acquisition ownership percentage acquired	57.00%		53.00%
Ownership percentage on share capital prior to initial offer period				4.00%
Ownership percentage on share capital after initial offer period			57.00%

Business Combination - Schedule

Business Combination - Schedule of Allocation of Purchase Price to Assets Acquired and Liabilities Assumed Based on Fair Values (Details) - USD ($) $ in Thousands	May 13, 2021	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 45,189	$ 13,897
EOS Imaging S.A.
Business Acquisition [Line Items]
Total cash paid in Initial Offer Period	$ 66,528
Total fair value of investment in EOS held before the Initial Offer Period	25,026
Fair value of noncontrolling interest acquired subsequent to Initial Offer Period	8,454
Purchase price	100,008
Cash and cash equivalents	16,778
Accounts receivable	9,083
Inventory	26,531
Other current assets	4,422
Property, plant and equipment, net	1,650
Right-of-use asset	4,341
Goodwill	31,822
Definite-lived intangible assets:
Other noncurrent assets	395
Contract liabilities	21,196
Long-term debt	15,297
Other liabilities assumed	30,021
Total identifiable net assets	100,008
EOS Imaging S.A. | Developed Technology
Definite-lived intangible assets:
Definite-lived intangible assets:	56,000
EOS Imaging S.A. | Customer Relationships
Definite-lived intangible assets:
Definite-lived intangible assets:	9,500
EOS Imaging S.A. | Trade Name Related Intangible Assets
Definite-lived intangible assets:
Definite-lived intangible assets:	6,000
EOS Imaging S.A. | EOS Share
Business Acquisition [Line Items]
Total cash paid in Initial Offer Period	46,908
Total fair value of investment in EOS held before the Initial Offer Period	23,549
EOS Imaging S.A. | OCEANEs
Business Acquisition [Line Items]
Total cash paid in Initial Offer Period	19,620
Total fair value of investment in EOS held before the Initial Offer Period	$ 1,477

Business Combination - Summary

Business Combination - Summary of Unaudited Proforma Results (Details) - EOS Imaging S.A. - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Total revenue	$ 64,077	$ 36,314	$ 115,064	$ 70,525
Net loss	$ (40,016)	$ (20,711)	$ (61,215)	$ (58,726)
Net loss per share, basic and diluted	$ (0.41)	$ (0.33)	$ (0.66)	$ (0.93)

Select Condensed Consolidated_3

Select Condensed Consolidated Balance Sheets Details - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 34,064	$ 23,887
Allowance for doubtful accounts	(321)	(360)
Accounts receivable, net	$ 33,743	$ 23,527

Select Condensed Consolidated_4

Select Condensed Consolidated Balance Sheets Details - Inventories, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 10,439	$ 6,064
Work-in-process	2,333	1,982
Finished goods	107,360	67,892
Inventory, gross, total	120,132	75,938
Less reserve for excess and obsolete finished goods	(33,417)	(29,937)
Inventories, net	$ 86,715	$ 46,001

Select Condensed Consolidated_5

Select Condensed Consolidated Balance Sheets Details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 125,731	$ 93,316
Less accumulated depreciation and amortization	(59,680)	(56,646)
Property and equipment, net	$ 66,051	36,670
Surgical instruments
Property, Plant and Equipment [Line Items]
Useful lives	4 years
Property and equipment, gross	$ 106,472	76,669
Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful lives	7 years
Property and equipment, gross	$ 9,757	6,562
Computer equipment
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Property and equipment, gross	$ 4,060	4,206
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Useful lives	5 years
Property and equipment, gross	$ 3,219	1,380
Leasehold improvements
Property, Plant and Equipment [Line Items]
Various useful lives of leasehold improvements	various
Property and equipment, gross	$ 688	1,761
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,535	$ 2,738

Select Condensed Consolidated_6

Select Condensed Consolidated Balance Sheets Details - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance Sheet Related Disclosures [Line Items]
Depreciation	$ 5	$ 2.2	$ 8.4	$ 4.2
Amortization of intangible assets	$ 1.5		1.9
Intellectual Property | Sales, General and Administrative Expense
Balance Sheet Related Disclosures [Line Items]
Asset impairment loss			0.2
EOS Imaging S.A.
Balance Sheet Related Disclosures [Line Items]
Additions to definite-lived intangible assets			71.5
Additions to goodwill			$ 31.8
EOS Imaging S.A. | Product Technology Intangible Assets
Balance Sheet Related Disclosures [Line Items]
Intangible assets acquired amortized on a straight-line basis over weighted-average useful lives			10 years
EOS Imaging S.A. | Trade Name Related Intangible Assets
Balance Sheet Related Disclosures [Line Items]
Intangible assets acquired amortized on a straight-line basis over weighted-average useful lives			9 years
EOS Imaging S.A. | Customer Related Intangible Assets
Balance Sheet Related Disclosures [Line Items]
Intangible assets acquired amortized on a straight-line basis over weighted-average useful lives			5 years

Select Condensed Consolidated_7

Select Condensed Consolidated Balance Sheets Details - Intangible Assets, Net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 124,628	$ 54,467
Less accumulated amortization	(31,647)	(29,747)
Intangible assets, net	92,981	24,720
Developed product technology
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 90,445	35,376
Useful lives	10 years
License agreements
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 5,536	5,536
Useful lives	1 year
Trademarks and trade names
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 6,692	792
Useful lives	9 years
Customer-related
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 16,800	7,458
Useful lives	5 years
Distribution network
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 4,027	4,027
Useful lives	2 years
In process research and development
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 1,128	$ 1,278
Useful lives	7 years

Select Condensed Consolidated_8

Select Condensed Consolidated Balance Sheets Details - Schedule of Intangible Assets, Future Expected Amortization Expense (Details) $ in Thousands	Jun. 30, 2021USD ($)
Balance Sheet Related Disclosures [Abstract]
Remainder of 2021	$ 5,330
2022	9,550
2023	9,550
2024	9,447
2025	8,862
Thereafter	50,242
Total	$ 92,981

Select Condensed Consolidated_9

Select Condensed Consolidated Balance Sheets Details - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Commissions and sales milestones	$ 11,477	$ 7,038
Payroll and payroll related	13,764	13,552
Litigation settlement obligation - short-term portion	4,000	4,000
Professional fees	2,971	3,551
Royalties	3,406	2,293
Interest	109	619
Administration fees	1,408	442
Accrued manufacturing expense	1,094
Other	5,226	3,769
Total accrued expenses	$ 43,455	$ 35,264

Select Condensed Consolidate_10

Select Condensed Consolidated Balance Sheets Details - Schedule of Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Litigation settlement obligation - long-term portion	$ 5,795	$ 7,634
Tax liabilities	3,345	373
Royalties	2,655	1,678
Other	3,348	1,703
Other long-term liabilities	$ 15,143	$ 11,388

Discontinued Operations - Addit

Discontinued Operations - Additional Information (Details) $ in Thousands	Sep. 01, 2016option	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		$ 62,249	$ 29,629	$ 106,370	$ 59,744
Cost of revenues		21,184	8,787	33,447	17,871
Supply agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		400	800	800	1,800
Cost of revenues		$ 400	$ 800	$ 900	$ 1,800
Discontinued operations, disposed of by sale | International Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Supply commitment term	3 years
Supply agreement, number of annual options to extend | option	2
Supply agreement, extended term			12 months
Supply agreement, extended period			2021-08

Debt - MidCap Facility Agreemen

Debt - MidCap Facility Agreement (Details) - USD ($) $ in Thousands	May 29, 2020	Jun. 30, 2020
Debt Disclosure [Abstract]
Final settlement under agreement	$ 9,600	$ 56,615

Debt - Squadron Medical Credit

Debt - Squadron Medical Credit Agreement (Details) - USD ($)	Dec. 16, 2020	Nov. 06, 2018	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	May 29, 2020	Mar. 27, 2019
Line Of Credit Facility [Line Items]
Issuance of common stock			100,184,000		82,294,000
Number of warrants outstanding			20,525,288
Loss on debt extinguishment				$ (1,555,000)
Squadron Medical Credit Agreement
Line Of Credit Facility [Line Items]
Issuance of common stock	2,700,270
Common stock price per share	$ 11.11
Additional debt issuance costs	$ 3,800,000		$ 11,900,000
Principal outstanding under term loan			45,000,000
Additional borrowing capacity			40,000,000
New debt issuance costs	30,000,000
Loss on debt extinguishment		$ 6,100,000
Debt instrument capitalized non-cash costs		$ 3,800,000
Debt carrying amount, net of issuance cost			33,100,000
Debt issuance costs	3,800,000		$ 11,900,000
Squadron Medical Credit Agreement | Common Stock | Participant Lender
Line Of Credit Facility [Line Items]
Number of warrants issued (in shares)		845,000					4,838,710
Exercise price of warrants		$ 3.15				$ 4.88	$ 2.17
Additional warrants issued						1,075,820
Number of warrants outstanding			6,759,530
Squadron Medical Credit Agreement | Term Loan
Line Of Credit Facility [Line Items]
Secured debt agreement	$ 30,000,000
Squadron Medical Credit Agreement | Line of Credit
Line Of Credit Facility [Line Items]
Floor on interest rate		9.00%
Ceiling on interest rate		12.00%
Payment terms			Interest-only payments are due monthly until December 2023 and joined by $1.0 million monthly principal payments beginning December 2023. Any remaining principal amounts of the term loan will be due on June 30, 2026.
Debt instrument, monthly principal payments		$ 1,000,000
Line of credit, unused capacity, commitment fee percentage		1.00%
Squadron Medical Credit Agreement | Line of Credit | London Interbank Offered Rate (LIBOR)
Line Of Credit Facility [Line Items]
Interest rate description		LIBOR plus 8.0
Basis spread		8.00%

Debt - Paycheck Protection Loan

Debt - Paycheck Protection Loan (Details) - USD ($)	Apr. 23, 2020	Jun. 30, 2021	Dec. 31, 2020
Line Of Credit Facility [Line Items]
Short-term debt		$ 10,988,000	$ 4,167,000
Paycheck Protection Program Loans
Line Of Credit Facility [Line Items]
Proceeds from loan	$ 4,300,000
Debt instrument, maturity date	Apr. 21, 2022
Interest rate	1.00%
Debt instrument, Description		Commencing August 21, 2021, the Company is required to pay the lender equal monthly payments of principal and interest and required to fully amortize by April 21, 2022 the principal amount outstanding on the PPP Loan as of the date prescribed by guidance issued by U.S. Small Business Administration (“SBA”).
Prepayment penalties	$ 0
Amount of compensation excluded for payroll costs	$ 100,000,000
Maximum percentage forgiven for non-payroll costs.	25.00%
Maximum amount of compensation to reduce the forgiveness	$ 100,000,000
Short-term debt		$ 4,300,000

Debt - Inventory Financing Agre

Debt - Inventory Financing Agreement (Details) - Inventory Financing Agreement - USD ($)	6 Months Ended
	Jun. 30, 2021	May 31, 2021	Nov. 30, 2020	Nov. 30, 2018
Line Of Credit Facility [Line Items]
Maximum borrowing capacity		$ 6,000,000	$ 6,000,000	$ 3,000,000
Current availability	$ 9,000,000
Line of Credit
Line Of Credit Facility [Line Items]
Debt instrument, maturity date	Nov. 6, 2023
Debt instrument, frequency of periodic payment	monthly
Outstanding obligation under inventory financing agreement	$ 7,500,000
London Interbank Offered Rate (LIBOR) | Line of Credit
Line Of Credit Facility [Line Items]
Interest rate description	LIBOR plus 8.0%
Basis spread	8.00%
Floor on interest rate	9.00%
Ceiling on interest rate	12.00%

Debt - OCEANE Convertible Bonds

Debt - OCEANE Convertible Bonds (Details) € in Millions, $ in Millions	Jun. 20, 2021Day	May 31, 2018USD ($)ConvertibleBond	May 31, 2018EUR (€)ConvertibleBond	Jun. 30, 2021USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2021EUR (€)
EOS
Debt Instrument [Line Items]
Percentage of ownership acquired				100.00%	100.00%	100.00%
OCEANE
Debt Instrument [Line Items]
Percentage of ownership acquired				57.00%	57.00%	57.00%
OCEANE Convertible Bonds
Debt Instrument [Line Items]
Carrying value of OCEANEs				$ 15.1	$ 15.1	€ 12.6
OCEANE Convertible Bonds | EOS
Debt Instrument [Line Items]
Number of OCEANE convertible bonds issued | ConvertibleBond		4,344,651	4,344,651
Aggregate gross proceeds		$ 34.3	€ 29.5
Interest rate		6.00%	6.00%
Payment terms					The OCEANEs are unsecured obligations of EOS, rank equally with all other unsecured and unsubordinated obligations of EOS, and pay interest at a rate equal to 6% per year, payable semiannually in arrears on May 31 and November 30 of each year, beginning November 30, 2018
Debt instrument, frequency of periodic payment		semiannually	semiannually
Debt instrument, Date of first payment		Nov. 30, 2018	Nov. 30, 2018
Debt instrument, maturity date		May 31, 2023	May 31, 2023
Interest expense | $				$ 0.1	$ 0.1
Initial conversion rate		1	1
Threshold percentage of par value trigger	150.00%
Consecutive trading days	40
Threshold percentage of debt instrument outstanding	15.00%
OCEANE Convertible Bonds | EOS | Minimum [Member]
Debt Instrument [Line Items]
Consecutive trading days	20

Debt - Other Debt Agreements (D

Debt - Other Debt Agreements (Details) - EOS Imaging S.A. $ in Millions	4 Months Ended	6 Months Ended
	Apr. 30, 2021EUR (€)Agreement	Jun. 30, 2021USD ($)	Jun. 30, 2021EUR (€)
Line Of Credit Facility [Line Items]
Number of loan agreements | Agreement	2
Debt instrument term	12 months
Percentage of principal state guaranteed	90.00%
Percentage of cost of state guaranty	0.25%
Debt instrument interest-free rate amount	€ 3,266,667
Debt instrument interest rate	1.75%
Debt instrument interest rate amount	€ 1,450,000
Line of credit facility description		The loan capital and loan guaranty costs are payable in full at the end of the 12-month term or the loan may be extended up to 5 additional years.  If the Company choses to extend the debt, the election must be made by the Company between month 8 and month 11.
Line of credit facility extension description		The extension will carry an interest rate at the banks’ refinancing cost, to be applied from year 2 to year 6 and an increased state guaranty cost (50 to 200 bps, as per a scale with company size and extension year).
Loan One
Line Of Credit Facility [Line Items]
Outstanding obligation under inventory financing agreement		$ 0.5	€ 400,000
Loan Two
Line Of Credit Facility [Line Items]
Outstanding obligation under inventory financing agreement		$ 5.1	€ 4,300,000
Maximum
Line Of Credit Facility [Line Items]
Debt instrument loan extended additional period	5 years

Debt - Principal Payments on De

Debt - Principal Payments on Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Remainder of 2021	$ 3,184
2022	7,816
2023	23,652
2024	12,018
2025	12,000
Thereafter	20,000
Total	78,670
Less: unamortized debt discount and debt issuance costs	(11,893)
Total	66,777
Less: short-term debt	(10,988)	$ (4,167)
Long-term debt	$ 55,789	$ 37,999

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	Apr. 09, 2021USD ($)ft²	Dec. 04, 2019USD ($)ft²	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Loss Contingencies [Line Items]
Lessee operating lease, description					The Company recognizes right-of-use assets (“ROU assets”) and lease liabilities for office buildings and certain equipment with lease terms of 1 year to 10 years, some of which include options to extend and/or terminate the leases. Any short-term leases defined as twelve months or less or month-to-month leases were excluded and continue to be expensed each month. Total costs associated with these short-term leases is immaterial to all periods presented.
Right-of-use asset			$ 26,604,000		$ 26,604,000		$ 1,177,000
Lease Liability			28,190,000		28,190,000
Liability in connection with lawsuit			0		0
Alphatec Spine, Inc.
Loss Contingencies [Line Items]
Guaranteed obligated minimum royalty payments through 2026 and beyond			3,400,000		3,400,000
Third-party Provider
Loss Contingencies [Line Items]
Minimum purchase commitment requirements			1,800,000		$ 1,800,000
Minimum purchase commitment to be paid period					3 years
Recognized an ROU asset related to agreement amount					$ 500,000
Rent expense pertaining to assets			100,000	$ 0	200,000	$ 0
Leased assets within agreement			$ 400,000		$ 400,000
EOS Imaging S.A. | Inventory Purchase | Third-party Supplier
Loss Contingencies [Line Items]
Minimum purchase commitment requirements period month and year					2025-12
Remaining minimum purchase commitment required					$ 28,800,000
Building lease
Loss Contingencies [Line Items]
Operating lease term	7 years	10 years
Area for facility of office, engineering and research and development space | ft²	75,643	121,541
Lease agreement commencement date	May 1, 2021	Feb. 1, 2021
Lease agreement expiry date	May 1, 2028	Jan. 31, 2031
Lease renewal term	236 months	260 months
Right-of-use asset	$ 1,700,000	$ 21,100,000
Lease Liability		$ 21,500,000
Beginning and end of abatement period		full abatement during months two through ten
Annual increase in base rent	3.00%	3.00%
Expected date of proportionate share of building upon commencement lease	May 1, 2021
Expected percentage to occupy lease premises	100.00%
Building lease | First year
Loss Contingencies [Line Items]
Lease base rent payment per month		$ 200,000
Minimum [Member]
Loss Contingencies [Line Items]
Operating lease term			1 year		1 year
Minimum [Member] | Building lease | First year
Loss Contingencies [Line Items]
Abatement period		2 months
Maximum
Loss Contingencies [Line Items]
Operating lease term			10 years		10 years
Maximum | Building lease | First year
Loss Contingencies [Line Items]
Abatement period		10 months

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Annual Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Remainder of 2021	$ 857
2022	4,340
2023	4,546
2024	4,583
2025	4,617
Thereafter	22,614
Total undiscounted lease payments	41,557
Less: imputed interest	(13,367)
Operating lease liability	28,190
Less: current portion of operating lease liability	(2,777)	$ (885)
Operating lease liability, less current portion	$ 25,413	$ 41

Commitments and Contingencies_3

Commitments and Contingencies - Summary of Weighted-Average Remaining Lease Term and Discount Rate (Details)	Jun. 30, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Weighted-average remaining lease term (years)	9 years 14 days	8 months 12 days
Weighted-average discount rate	8.50%	10.50%

Commitments and Contingencies_4

Commitments and Contingencies - Summary of Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Rent expense	$ 1,119	$ 331	$ 2,202	$ 658
Cash paid for amounts included in measurement of lease liabilities	$ 495	$ 372	$ 875	$ 741

Orthotec Settlement - Additiona

Orthotec Settlement - Additional Information (Details)	Jul. 01, 2016USD ($)	Oct. 01, 2014USD ($)	Aug. 13, 2014USD ($)installment	Oct. 31, 2020USD ($)installment	Sep. 30, 2014USD ($)	Apr. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Jun. 30, 2021USD ($)installment
Loss Contingencies [Line Items]
Litigation settlement, remaining outstanding balance including interest								$ 0
Orthotec LLC, litigation settlement
Loss Contingencies [Line Items]
Judgment assessed by court for (against) company			$ 49,000,000
Payments of settlement						$ 15,750,000	$ 1,750,000	$ 47,200,000
Number of quarterly installments | installment			28					5
Litigation settlement interest, quarterly installments, amount			$ 1,100,000
Litigation settlement, final installment amount			700,000
Litigation settlement, remaining outstanding balance including interest								$ 10,600,000
Orthotec LLC, litigation settlement | HealthpointCapital, LLC
Loss Contingencies [Line Items]
Judgment assessed by court for (against) company				$ 5,000,000	$ 5,000,000
Payments of settlement	$ 1,000,000							1,100,000
Number of quarterly installments | installment				5
Contribution amount to be paid by other party				$ 5,000,000	$ 5,000,000
Remaining receivable								$ 1,800,000
Beginning Fourth Quarter of 2014 | Orthotec LLC, litigation settlement
Loss Contingencies [Line Items]
Litigation settlement, full amount to be paid in quarterly installments		$ 31,500,000
Litigation settlement interest, quarterly installments, amount			$ 1,100,000
Litigation settlement interest rate			7.00%
Litigation settlement payments, quarterly payment amount			$ 1,100,000
Final Installment | Orthotec LLC, litigation settlement
Loss Contingencies [Line Items]
Number of quarterly installments | installment			1

Orthotec Settlement - Schedule

Orthotec Settlement - Schedule of Reconciliation of Total Net Settlement Obligation (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Litigation settlement obligation - short-term portion	$ 4,000	$ 4,000
Litigation settlement obligation - long-term portion	5,795	7,634
Total	9,795	11,634
Future interest	838	1,199
Total settlement obligation, gross	10,633	12,833
Related party receivable - included in stockholders' equity	(1,800)	(4,000)
Total settlement obligation, net	$ 8,833	$ 8,833

Business Segment and Geograph_3

Business Segment and Geographic Information - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021segment
Segment Reporting [Abstract]
Number of operating segments	1

Business Segment and Geograph_4

Business Segment and Geographic Information - Schedule of Net Revenue and Property, Plant and Equipment, Net, by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 62,249	$ 29,629	$ 106,370	$ 59,744
Property and equipment, net	66,051		66,051		$ 36,670
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	59,294	28,834	103,010	57,904
Property and equipment, net	64,729		64,729		$ 36,670
International
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	2,955	$ 795	3,360	$ 1,840
Property and equipment, net	$ 1,322		$ 1,322

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss, basic and diluted	$ (38,205)	$ (22,903)	$ (15,805)	$ (20,722)	$ (61,108)	$ (36,527)
Denominator:
Weighted-average shares outstanding, basic and diluted	98,541		63,713		92,912	63,140
Net loss per share, basic and diluted:	$ (0.39)		$ (0.25)		$ (0.66)	$ (0.58)

Net Loss Per Share - Anti-Dilut

Net Loss Per Share - Anti-Dilutive Securities Not Included in Diluted Net Loss Per Share (Details) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities not included in diluted net loss per share (in shares)	32,891	37,980
Series A convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities not included in diluted net loss per share (in shares)	29	67
Options to purchase common stock and employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities not included in diluted net loss per share (in shares)	3,659	4,167
Unvested restricted share awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities not included in diluted net loss per share (in shares)	8,678	8,345
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities not included in diluted net loss per share (in shares)	20,525	25,401

Stock-Benefit Plans and Equit_3

Stock-Benefit Plans and Equity Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2019	Dec. 31, 2017	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2017	Jun. 16, 2021	Jun. 17, 2020	May 09, 2020	Apr. 08, 2020	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding			20,525,288		20,525,288
Stock-based compensation					$ 15,970	$ 8,143
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued			12,421,000
Mr. Miles
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant expiration period		5 years
Number of warrants exercised					0
Number of warrants issued (in shares)		1,327,434					1,327,434
Exercise price of warrants		$ 5					$ 5
Stock-based compensation							$ 1,400
Safe Op Surgical Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant expiration period					5 years
Proceeds from exercise of warrant					$ 100
Number of warrants exercised			0	0	969,932	0
Warrants outstanding			1,194,943		1,194,943
Number of warrants issued (in shares)			2,200,000		2,200,000
Exercise price of warrants			$ 3.50		$ 3.50
2017 PIPE Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant expiration period					5 years
Proceeds from exercise of warrant			$ 800		$ 1,000	$ 300
Number of warrants exercised			375,000	0	520,000	125,000
Warrants outstanding			2,587,000		2,587,000
Exercise price of warrants			$ 2		$ 2
2018 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant expiration period					5 years
Proceeds from exercise of warrant			$ 1,000		$ 1,300	$ 900
Number of warrants exercised			693,335	0	2,841,116	2,059,524
Warrants outstanding			8,538,569		8,538,569
Exercise price of warrants			$ 3.50		$ 3.50
Squadron Medical | Participant Lender
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants exercised					0
Warrants outstanding										6,759,530
Number of warrants issued (in shares)										1,075,820		4,838,710	845,000
Exercise price of warrants										$ 4.88		$ 2.17	$ 3.15
Warrants And Rights Outstanding Maturity Date										May 29, 2027
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant			662,036		662,036			500,000
2016 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant			3,827,639		3,827,639				7,000,000
2017 Distributor Inducement Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants issued (in shares)			195,000		195,000
Number of warrants available to be granted			575,000		575,000
2017 Distributor Inducement Plan | Board of Directors Chairman | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share authorized grant of common stock		1,000,000					1,000,000
2017 Distributor Inducement Plan | Restricted Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted under the plan					284,500
Number of stock units issued					84,500
2017 Development Services Plan | Board of Directors Chairman | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant											7,000,000
Common stock issued					0
2017 Development Services Plan | Restricted Common Stock | Board of Directors Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted under the plan					6,709,000
2019 Management Objective Strategic Incentive Plan | Board of Directors Chairman | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share authorized grant of common stock	500,000
Maximum grant of shares per participant	50,000
2019 Management Objective Strategic Incentive Plan | Unvested Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted under the plan					130,000
2019 Management Objective Strategic Incentive Plan | Unvested Restricted Stock Award | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares available for purchase under the plan			25,000		25,000

Stock-Benefit Plans and Equit_4

Stock-Benefit Plans and Equity Transactions - Summary of Total Stock Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 11,496	$ 4,575	$ 15,970	$ 8,143
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	235	128	330	235
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	664	563	1,162	954
Sales, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 10,597	$ 3,884	$ 14,478	$ 6,954

Stock-Benefit Plans and Equit_5

Stock-Benefit Plans and Equity Transactions - Summary Common Stock Reserved for Future Issuance (Details) shares in Thousands	Jun. 30, 2021shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	39,303
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	3,616
Unvested Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	8,678
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	662
Series A Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	29
Warrants Outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	20,525
Authorized for Future Grant Under the Distributor and Development Services Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	952
Authorized for Future Grant Under the Management Objective Strategic Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	345
Authorized for Future Grant Under the Company Equity Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	4,496

Stock-Benefit Plans and Equit_6

Stock-Benefit Plans and Equity Transactions - Summary of All Outstanding Warrants for Common Stock (Details)	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Class Of Warrant Or Right [Line Items]
Number of Warrants	20,525,288
2017 PIPE Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	2,587,000
Strike Price | $ / shares	$ 2
Expiration	June 2022
2018 PIPE Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	8,538,569
Strike Price | $ / shares	$ 3.50
Expiration	May 2023
SafeOp Surgical Merger Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	1,194,943
Strike Price | $ / shares	$ 3.50
Expiration	May 2023
2018 Squadron Medical Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	845,000
Strike Price | $ / shares	$ 3.15
Expiration	May 2027
2019 Squadron Medical Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	4,838,710
Strike Price | $ / shares	$ 2.17
Expiration	May 2027
2020 Squadron Medical Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	1,075,820
Strike Price | $ / shares	$ 4.88
Expiration	May 2027
Executive Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	1,327,434
Strike Price | $ / shares	$ 5
Expiration	December 2022
Other Warrants
Class Of Warrant Or Right [Line Items]
Number of Warrants	117,812	[1]
Strike Price | $ / shares	$ 2.87	[1]
Expiration	Various through May 2023	[1]
[1]	Weighted-average strike price.

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate from continuing operations	(0.11%)	(0.38%)	(0.12%)	(0.27%)
Federal statutory income tax rate			21.00%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) $ in Thousands	Jul. 01, 2016USD ($)	Aug. 13, 2014USD ($)installment	Oct. 31, 2020USD ($)installment	Sep. 30, 2014USD ($)	Apr. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Jun. 30, 2021USD ($)installment	Dec. 31, 2020USD ($)
Related Party Transaction [Line Items]
Remaining settlement amount to be contributed							$ 1,800	$ 4,000
Withholding tax receivable from officer							1,076	$ 1,076
Restricted Stock Unit
Related Party Transaction [Line Items]
Withholding tax receivable from officer							1,100
Orthotec LLC, litigation settlement
Related Party Transaction [Line Items]
Payments of settlement					$ 15,750	$ 1,750	$ 47,200
Judgment assessed by court for (against) company		$ (49,000)
Number of quarterly installments | installment		28					5
Orthotec LLC, litigation settlement | HealthpointCapital, LLC
Related Party Transaction [Line Items]
Payments of settlement	$ 1,000						$ 1,100
Judgment assessed by court for (against) company			$ (5,000)	$ (5,000)
Number of quarterly installments | installment			5
Remaining settlement amount to be contributed							$ 1,800