10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended September 30, 2016

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period from ______ to _______.

Commission file number 001-36443

K2M GROUP HOLDINGS, INC.

(Exact name of Registrant as specified in its charter)

Delaware	27-2977810
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
600 Hope Parkway SE, Leesburg, Virginia	20175
(Address of principal executive offices)	(Zip Code)

(703) 777-3155

Registrant’s telephone number, including area code: 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x     No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	¨	Accelerated filer	ý
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  ¨    No  x

The number of shares outstanding of Registrant’s common stock, par value $0.001 per share, on October 27, 2016 was 42,197,647.

K2M GROUP HOLDINGS, INC.

FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2016

TABLE OF CONTENTS

	SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS	2
PART I: FINANCIAL INFORMATION
ITEM 1.	FINANCIAL STATEMENTS	5
	CONDENSED CONSOLIDATED BALANCE SHEETS	5
	CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS	6
	CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS	7
	CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY	8
	CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS	9
	NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS	10
ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	21
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	32
ITEM 4.	CONTROLS AND PROCEDURES	33
PART II: OTHER INFORMATION
ITEM 1.	LEGAL PROCEEDINGS	34
ITEM 1A.	RISK FACTORS	34
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	34
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	35
ITEM 4.	MINE SAFETY DISCLOSURES	35
ITEM 5.	OTHER INFORMATION	35
ITEM 6.	EXHIBITS	36
SIGNATURES		37

1

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains “forward-looking statements” within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), which are subject to the “safe harbor” created by that section. These statements reflect our current views with respect to, among other things, our operations and financial performance. Forward-looking statements include all statements that are not historical facts. In some cases, you can identify these forward-looking statements by the use of words such as “outlook,” “believes,” “expects,” “potential,” “continues,” “may,” “will,” “should,” “could,” “seeks,” “predicts,” “intends,” “plans,” “estimates,” “anticipates” or the negative version of these words or other comparable words. Such forward-looking statements are subject to various risks and uncertainties. Accordingly, there are or will be important factors that could cause actual outcomes or results to differ materially from those indicated in these statements. We believe these factors include but are not limited to those described under “Risk Factors” included in our Annual Report on Form 10-K dated December 31, 2015, as updated by our periodic filings, which are accessible on the SEC website at www.sec.gov. These factors, including the following, should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in this Form 10-Q:

• our ability to achieve or sustain profitability in the future;

• our ability to demonstrate to spine surgeons the merits of our products;

• pricing pressures and our ability to compete effectively generally;

• collaboration and consolidation in hospital purchasing;

• inadequate coverage and reimbursement for our products from third-party payors;

• lack of long-term clinical data supporting safety and efficacy of our products;

• dependence on a limited number of third-party suppliers;

• our ability to maintain and expand our network of direct sales employees, independent sales agencies and international distributors and their level of sales or distribution activity with respect to our products;

• proliferation of physician-owned distributorships (“PODs”) in the industry;

• decline in the sale of certain key products;

• loss of key personnel;

• our ability to enhance new product offerings through research and development;

• our ability to manage expected growth;

• acquisitions of or investments in new or complementary businesses, products or technologies;

• our ability to train surgeons on the safe and appropriate use of our products;

• costs associated with high levels of inventory;

• impairment of our goodwill and intangible assets;

• disruptions in our main facility or information technology systems;

• our ability to ship a sufficient number of our products to meet demand;

2

• our ability to strengthen our brand;

• fluctuations in insurance cost and availability;

• our ability to comply with extensive governmental regulation within the United States and foreign jurisdictions;

• our ability to maintain or obtain regulatory approvals and clearances within the United States and foreign jurisdictions;

• voluntary corrective actions by us or our distribution or other business partners or agency enforcement actions;

• recalls or serious safety issues with our products;

• enforcement actions by regulatory agencies for improper marketing or promotion;

• misuse or off-label use of our products;

• delays or failures in clinical trials and results of clinical trials;

• legal restrictions on our procurement, use, processing, manufacturing or distribution of allograft bone tissue;

• negative publicity concerning methods of tissue recovery and screening of donor tissue;

• costs and liabilities relating to environmental laws and regulations;

• our failure or the failure of our agents to comply with fraud and abuse laws;

• U.S. legislative or Food and Drug Administration (“FDA”) regulatory reforms;

• adverse effects of medical device tax provisions;

• our ability to generate significant sales;

• potential fluctuations in sales volumes and our results of operations over the course of the year;

• uncertainty in future capital needs and availability of capital to meet our needs;

• availability of borrowings under our credit facility;

• continuing worldwide economic instability;

• our ability to protect our intellectual property rights;

• patent litigation and product liability lawsuits;

• damages relating to trade secrets or non-competition or non-solicitation agreements;

• risks associated with operating internationally;

• fluctuations in foreign currency exchange rates;

• our ability to comply with the Federal Corrupt Practices Act (“FCPA”) and similar laws;

3

• possible conflicts of interest with our large shareholders;

• increased costs and additional regulations and requirements as a result of being a public company; and

• our ability to implement and maintain effective internal control over financial reporting.

We operate in a very competitive and challenging environment. New risks and uncertainties emerge from time to time, and it is not possible for us to predict all risks and uncertainties that could have an impact on the forward-looking statements contained in this Quarterly Report. We cannot assure you that the results, events and circumstances reflected in the forward-looking statements will be achieved or occur, and actual results, events or circumstances could differ materially from those described in the forward-looking statements.

The forward-looking statements made in this Quarterly Report on Form 10-Q relate only to events as of the date on which the statements are made. We undertake no obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise, except as required by law. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward-looking statements. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures, investments or other strategic transactions we may make.

Website and Social Media Disclosure

We use our website (www.k2m.com), our corporate Facebook page (www.facebook.com/K2MInc) and our corporate Twitter account (@K2MInc) as channels of distribution of company information. The information we post through these channels may be deemed material. Accordingly, investors should monitor these channels, in addition to following our press releases, SEC filings and public conference calls and webcasts. In addition, you may automatically receive e-mail alerts and other information about K2M when you enroll your e-mail address by visiting the “Email Alerts” section of our website at http://investors.k2m.com/alerts.cfm. The contents of our website and social media channels are not, however, a part of this report.

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PART I: FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

K2M GROUP HOLDINGS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(In Thousands, Except Share and Per Share Data)

	September 30,			December 31,
	2016			2015
ASSETS
Current assets:
Cash and cash equivalents	$	46,117		$	34,646
Accounts receivable, net	43,215			38,773
Inventory, net	66,737			62,002
Prepaid expenses and other current assets	6,443			19,820
Total current assets	162,512			155,241
Property, plant and equipment, net	51,021			38,318
Goodwill	121,814			121,814
Intangible assets, net	25,340			33,123
Other assets, net	30,579			26,016
Total assets	$	391,266		$	374,512
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current maturities under capital lease obligation	$	937		$	284
Accounts payable	14,528			22,483
Accrued expenses	13,789			13,559
Accrued payroll liabilities	12,318			11,507
Total current liabilities	41,572			47,833
Convertible senior notes	36,383			—
Capital lease obligation, net of current maturities	35,187			34,140
Deferred income taxes, net	5,009			5,042
Other liabilities	820			835
Total liabilities	118,971			87,850
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 750,000,000 shares authorized; 42,206,258 and        41,337,692 shares issued and 42,197,647 and 41,337,692 shares outstanding,        respectively.	42			41
Additional paid-in capital	471,915			454,153
Accumulated deficit	(198,614		)	(169,421		)
Accumulated other comprehensive (loss) income	(914		)	1,889
Treasury stock, at cost, 8,611 and 0 shares, respectively.	(134		)	—
Total stockholders’ equity	272,295			286,662
Total liabilities and stockholders’ equity	$	391,266		$	374,512

See accompanying notes to unaudited condensed consolidated financial statements.

5

K2M GROUP HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

(In Thousands, Except Share and Per Share Data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Revenue	$	59,310		$	55,009		$	174,843		$	161,787
Cost of revenue	19,512			17,390			58,747			53,507
Gross profit	39,798			37,619			116,096			108,280
Operating expenses:
Research and development	5,199			5,154			15,989			14,808
Sales and marketing	27,384			26,808			84,132			79,588
General and administrative	13,312			15,667			41,343			42,575
Total operating expenses	45,895			47,629			141,464			136,971
Loss from operations	(6,097		)	(10,010		)	(25,368		)	(28,691		)
Other expense, net:
Foreign currency transaction loss	(547		)	(12		)	(1,099		)	(1,552		)
Interest expense	(1,319		)	(110		)	(2,705		)	(354		)
Total other expense, net	(1,866		)	(122		)	(3,804		)	(1,906		)
Loss before income taxes	(7,963		)	(10,132		)	(29,172		)	(30,597		)
Income tax (benefit) expense	(53		)	83			21			125
Net loss	(7,910		)	(10,215		)	(29,193		)	(30,722		)
Basic and diluted	$	(0.19	)	$	(0.25	)	$	(0.70	)	$	(0.77	)
Weighted average shares outstanding:
Basic and diluted	41,940,370			41,074,245			41,639,609			39,892,068

See accompanying notes to unaudited condensed consolidated financial statements.

6

K2M GROUP HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(Unaudited)

(In Thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net loss	$	(7,910	)	$	(10,215	)	$	(29,193	)	$	(30,722	)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(608		)	(951		)	(2,803		)	719
Other comprehensive (loss) income	(608		)	(951		)	(2,803		)	719
Comprehensive loss	$	(8,518	)	$	(11,166	)	$	(31,996	)	$	(30,003	)

See accompanying notes to unaudited condensed consolidated financial statements.

7

K2M GROUP HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY

(Unaudited)

(In Thousands, Except Share Data)

	Common Stock			Additional Paid-in Capital			Accumulated Deficit			Accumulated Other Comprehensive Loss			Treasury Stock			Total Stockholders’ Equity
	Shares	Amount
Balance at December 31, 2015	41,337,692	$	41	$	454,153		$	(169,421	)	$	1,889		$	—		$	286,662
Net loss	—	—		—			(29,193		)	—			—			(29,193		)
Other comprehensive loss	—	—		—			—			(2,803		)	—			(2,803		)
Stock-based compensation expense	—	—		5,381			—			—			—			5,381
Convertible senior notes equity conversion option	—	—		11,666			—			—			—			11,666
Debt issuance costs allocated to equity	—	—		(680		)	—			—			—			(680		)
Issuances and exercise of stock-based compensation benefit plans, net of income tax	859,955	1		1,395			—			—			(134		)	1,262
Balance at September 30, 2016	42,197,647	$	42	$	471,915		$	(198,614	)	$	(914	)	$	(134	)	$	272,295

See accompanying notes to unaudited condensed consolidated financial statements.

8

K2M GROUP HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(In Thousands)

	Nine Months Ended September 30,
	2016			2015
Operating activities
Net loss	$	(29,193	)	$	(30,722	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	21,452			18,396
Provision for allowance for doubtful accounts	(18		)	177
Provision for inventory reserves	2,817			1,128
Stock-based compensation expense	5,381			8,863
Accretion of discounts and amortization of issuance costs of convertible senior notes	558			—
Deferred income taxes	(33		)	—
Changes in operating assets and liabilities:
Accounts receivable	(5,292		)	(7,729		)
Inventory	(6,466		)	(6,839		)
Prepaid expenses and other assets	(7,636		)	(5,262		)
Accounts payable, accrued expenses, and accrued payroll liabilities	3,442			8,795
Net cash used in operating activities	(14,988		)	(13,193		)
Investing activities
Purchase of surgical instruments	(10,986		)	(6,595		)
Purchase of property, plant and equipment	(16,338		)	(2,424		)
Changes in cash restricted for leasehold improvements	6,153			—
Purchase of intangible assets	(1,282		)	(538		)
Net cash used in investing activities	(22,453		)	(9,557		)
Financing activities
Borrowings on bank line of credit	19,500			25,000
Payments on bank line of credit	(19,500		)	(25,000		)
Proceeds from issuance of convertible senior notes, net of issuance costs	47,575			—
Proceeds from issuances of common stock, net of issuance costs	—			54,401
Issuances and exercise of stock-based compensation benefit plans, net of income tax	1,262			925
Net cash provided by financing activities	48,837			55,326
Effect of exchange rate changes on cash and cash equivalents	75			(311		)
Net increase in cash and cash equivalents	11,471			32,265
Cash and cash equivalents at beginning of period	34,646			11,411
Cash and cash equivalents at end of period	$	46,117		$	43,676
Significant non-cash investing activities
Leasehold improvements, including property under capital lease	$	598		$	—
Significant non-cash financing activities
Deferred convertible senior notes issuance costs	$	486		$	—
Common stock offering costs	$	—		$	244
Cash paid for:
Income taxes	$	177		$	93
Interest	$	339		$	91

See accompanying notes to unaudited condensed consolidated financial statements.

9

K2M Group Holdings, Inc.

Notes to Condensed Consolidated Financial Statements

For the Three and Nine Ended September 30,2016and2015

(Unaudited)

(In Thousands, Except Share and Per Share Data)

1.        GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

In this Quarterly Report on Form 10-Q, unless the context otherwise requires, references to “K2M,” “the Company,” “we,” “us” and “our,” refer to K2M Group Holdings, Inc. together with its consolidated subsidiaries.

We are a global medical device company focused on designing, developing and commercializing innovative complex spine and minimally invasive technologies and techniques. Our complex spine products are used by spine surgeons to treat some of the most difficult and challenging spinal pathologies, such as deformity (primarily scoliosis), trauma and tumor. We have applied our product development expertise in innovating complex spine technologies and techniques to the design, development, and commercialization of an expanding number of proprietary minimally invasive surgery, or MIS, products. Our MIS products are designed to allow for less invasive access to the spine and faster patient recovery times as compared to traditional open access surgical approaches for both complex spine and degenerative spine pathologies. We have leveraged these core competencies in the design, development and commercialization of an increasing number of products for patients suffering from degenerative spinal conditions.

Unaudited Interim Results

The accompanying condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015, the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive loss for the three and nine months ended September 30,2016 and 2015, the condensed consolidated statement of changes in stockholders’ equity as of September 30, 2016, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2016 and 2015 are unaudited. The unaudited interim consolidated financial statements have been prepared on the same basis of accounting as the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include normal recurring adjustments, necessary to present fairly our financial position and results of operations and cash flows for the periods presented. The results for the three and nine months ended September 30, 2016 are not necessarily indicative of future results. All information as of September 30, 2016 and for the three and nine month periods ending September 30, 2016 and 2015 within these notes to the condensed consolidated financial statements is unaudited.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and all of its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States or US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Net Loss per Share

Basic net loss per common share is determined by dividing the net loss allocable to common stockholders by the weighted average number of common shares outstanding during the periods presented, without consideration of common stock equivalents. Diluted loss per share is computed by dividing the net loss allocable to common stockholders by the weighted average number of shares of common stock and common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of our stock option grants and the if-converted method is used to determine the dilutive effect of the convertible senior notes. The weighted average shares used to calculate both basic and diluted loss per share are the same because common stock equivalents were excluded in the calculation of diluted loss per share because their effect would be anti-dilutive. Although included in our outstanding shares total as of September 30, 2016, shares of restricted stock contingently issuable until their restrictions lapse and have been excluded from the weighted average shares outstanding.

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Foreign Currency Translation and Other Comprehensive Loss

Our results of operations and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. Our reporting currency is the U.S. dollar, which is also the functional currency of our domestic entities, while the functional currency of our foreign subsidiaries are the British Pound, Euro and Swiss Franc. Assets and liabilities denominated in foreign currencies are translated at the rate of exchange on the balance sheet date. Revenues and expenses are translated using the average exchange rate for the period. Net gains and losses resulting from the translation of foreign financial statements are recorded in other comprehensive income (loss). Net foreign currency gains or losses resulting from transactions in currencies other than the functional currencies are included in other expense, net on the consolidated statements of operations.

Recent Accounting Pronouncements

We qualify as an “emerging growth company” (EGC) pursuant to the provisions of the JOBS Act and elected to take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act which permits EGCs to defer compliance with new or revised accounting standards (the EGC extension) until non-issuers are required to comply with such standards. Accordingly, so long as we continue to qualify as an EGC, we will not have to adopt or comply with new or revised accounting standards until non-issuers are required to comply with such standards.

In March 2016, the Financial Accounting Standards Board, or FASB issued ASU 2016-06, Contingent Put and Call Options in Debt Instruments (Topic 815), which addressesthe accounting for embedded derivatives related to debt contracts. The update clarifies that determining whether the economic characteristics of a put or call are clearly and closely related to its debt host requires only an assessment of the four-step decision sequence. It also indicates that entities are not required to separately assess whether the contingency itself is clearly and closely related. For public entities the guidance will be effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. The guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of the initial application. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance. We are currently assessing the impact of this guidance.

In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which addresses principal versus agent considerations, reporting revenue gross versus net in the new revenue recognition standard. The guidance clarifies how an entity should evaluate the unit of accounting to determine whether it is a specified good or service and how it should apply the control principle to certain types of arrangements. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. The guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of the initial application. We are currently assessing the impact of this guidance.

In March 2016, the FASB issued ASU No. 2016-09, Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which is intended to improve employee share-based payment accounting for companies that issue share-based awards to their employees. This guidance simplifies the accounting for share-based payment transactions, including consequences of income tax award, classification as either equity or liability, treatment of forfeitures, and classification on statement of cash flows. The recognition, measurement and reporting for share-based payments will be affected by this new guidance. For public entities other than EGCs that have elected the EGC extension, the guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance, but all of the guidance must be adopted in the same period. We are currently evaluating the impact of this guidance.

In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which includesfinal amendments to clarify the guidance on identifying performance obligations and accounting for licenses of intellectual property ("IP") in its new revenue recognition standard. The amendment allows entities to disregard goods or services that are immaterial in the context of a contract, assess whether the performance obligation is separately identifiable and whether the shipping and handling activities are a promised service in a contract. This guidance also clarifies how an entity should evaluate the nature of its promise in granting an IP license and when a promised good or service is distinct within the context of a contract. The guidance will be effective for annual reporting periods

11

beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. We are currently assessing the impact of this guidance.

In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, which clarifies that for a contract to be considered completed the entity should evaluate the collectability threshold or probability of collecting revenue. It provides that the fair value of noncash consideration such as equity should be measured at contract inception when determining the transaction price and any subsequent changes must be recorded as a gain or loss, not as revenue. The entity has the option to make an accounting policy election to exclude from the transaction price certain types of taxes such as sales tax, value-added tax and excise tax in lieu of evaluating such taxes they collect in all jurisdictions to determine whether a tax is levied to the entity or the customer. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. We are currently assessing the impact of this guidance.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This guidance eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees, and beneficial interests obtained in a financial asset securitization. It also provides clarifications related to separately identifiable cash-flows and application of the predominance principle based on evaluating the source and nature of the underlying cash flows when determining whether it is a financing, investing, operating or a combination of cash flow classifications. For public entities the guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance, but all of the guidance must be adopted in the same period. We are currently assessing the impact of this guidance.

2.    ACCOUNTS RECEIVABLE

The following table summarizes the accounts receivables, net of allowances:

	September 30, 2016			December 31, 2015
Accounts receivable	$	45,395		$	41,210
Allowances	(2,180		)	(2,437		)
Accounts receivable, net	$	43,215		$	38,773

3.    INVENTORY

The following table summarizes the inventory, net of allowances:

	September 30, 2016			December 31, 2015
Finished goods	$	99,478		$	90,226
Inventory allowances	(32,741		)	(28,224		)
Inventory, net	$	66,737		$	62,002

Inventory includes surgical instruments available for sale with a carrying value of $10,499 and $8,946 at September 30, 2016 and December 31, 2015, respectively.

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4.    PREPAID EXPENSES AND OTHER CURRENT ASSETS

The following table summarizes prepaid expenses and other current assets:

	September 30, 2016		December 31, 2015
Restricted cash	$	517	$	6,669
Landlord incentives for leasehold improvements	—		6,454
Prepaid expenses	2,522		2,408
Other	3,404		4,289
Total	$	6,443	$	19,820

Restricted cash represents funds designated for tenant improvements related to the new headquarters and operations facilities.

Landlord incentives for leasehold improvements represents incentives to be provided by the Landlord of our new headquarters and operations facilities under the capital lease agreement, which commenced in October 2015. Such incentives were received from our landlord upon the completion of actual improvements.

5.    PROPERTY, PLANT AND EQUIPMENT

The following table summarizes property, plant and equipment:

	Estimated Useful Lives	September 30, 2016			December 31, 2015
Buildings under capital lease	16 years	$	26,469		$	26,469
Leasehold improvements, including property under capital lease	15 years	19,317			9,717
Equipment	3-5 years	3,754			3,054
Software	3 years	4,644			4,231
Computer equipment	3 years	1,050			1,493
Furniture and office equipment	5-7 years	3,678			1,050
Vehicles and other	3 years	749			795
Total		59,661			46,809
Less accumulated depreciation and amortization		(8,640		)	(8,491		)
Property, plant and equipment, net		$	51,021		$	38,318

Depreciation and amortization expense for property, plant and equipment was $1,374 and $423 for the three months ended September 30, 2016 and 2015, respectively, and $3,526 and $1,513 for the nine months ended September 30, 2016 and 2015, respectively. Included in this total is amortization expense for buildings under capital lease, for which occupancy commenced in October 2015, of $416 and $1,247 for the three and nine months ended September 30, 2016. Interest expense on the capital lease obligation was $554 and $1,700 for the three and nine months ended September 30, 2016.

As of September 30, 2016 and December 31, 2015, we had leasehold improvements of approximately $18,745 and $8,242, respectively, for our new headquarters and operations facilities which were completed and placed in service in May 2016, following our occupancy of the new premises. Furniture and equipment at September 30, 2016 includes $4,059 of furniture and other capital equipment acquired for use in our new headquarters and operations facilities, which we began to depreciate in May 2016.

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6.    INTANGIBLE ASSETS

Intangible assets, net comprise the following:

	September 30, 2016
	Estimated Useful Lives	Gross		Accumulated Amortization			Net
Indefinite-lived intangible assets:
Trademarks	—	$	12,900	$	—		$	12,900
In-process research and development	—	900		—			900
Other	—	233		—			233
Subtotal		14,033		—			14,033
Subject to amortization
Developed technology	4 - 6 years	62,000		(56,581		)	5,419
Licensed technology	4 - 6 years	52,600		(52,437		)	163
Customer relationships	4 - 7 years	29,700		(25,988		)	3,712
Patents and other	2 - 17 years	3,277		(1,264		)	2,013
Subtotal		147,577		(136,270		)	11,307
Intangible assets, net		$	161,610	$	(136,270	)	$	25,340

	December 31, 2015
	Estimated Useful Lives	Gross		Accumulated Amortization			Net
Indefinite-lived intangible assets:
Trademarks	—	$	12,900	$	—		$	12,900
In-process research and development	—	900		—			900
Other	—	266		—			266
Subtotal		14,066		—			14,066
Subject to amortization
Developed technology	4 - 6 years	62,000		(52,243		)	9,757
Licensed technology	4 - 6 years	52,600		(52,325		)	275
Customer relationships	4 - 7 years	29,700		(22,805		)	6,895
Patents and other	2 - 17 years	3,245		(1,115		)	2,130
Subtotal		147,545		(128,488		)	19,057
Intangible assets, net		$	161,611	$	(128,488	)	$	33,123

Amortization expense of intangible assets was $2,594 and $2,560 for the three months ended September 30,2016 and 2015, respectively, and $7,781 and $7,733 for the nine months ended September 30,2016 and 2015, respectively.

As of September 30, 2016, the expected amortization expense for the remainder of 2016 and the following four years and thereafter is as follows:

	September 30, 2016
2016	$	2,594
2017	6,763
2018	267
2019	257
2020	232
Thereafter	1,194
Total	$	11,307

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7.    OTHER ASSETS

Other assets consist of the following:

	September 30, 2016		December 31, 2015
Surgical instruments, net	$	26,936	$	23,945
Restricted cash	2,411		1,298
Other	1,232		773
Total	$	30,579	$	26,016

Surgical instruments are stated net of accumulated amortization and allowances of $31,603 and $26,609 at September 30, 2016 and December 31, 2015, respectively. Amortization expense was $2,517 and $2,304 for the three months ended September 30,2016 and 2015, respectively, and $7,431 and $6,688 for the nine months ended September 30,2016 and 2015, respectively.

Restricted cash balances includes deposits made on pending bids or contracts with customers.

8.        ACCRUED EXPENSES

Accrued expenses consist of the following:

	September 30, 2016		December 31, 2015
Accrued commissions	$	5,834	$	5,336
Accrued royalties	3,081		2,704
Other	4,874		5,519
Total	$	13,789	$	13,559

9.        DEBT

Convertible Senior Notes

On August 11, 2016, we issued $50,000 aggregate principal amount of convertible senior notes (the “Notes”). The Notes pay interest at an annual rate of 4.125%, payable semi-annually in arrears on February 15 and August 15 of each year beginning on February 15, 2017 and mature on August 15, 2036, unless earlier converted, redeemed or repurchased by us. We received net proceeds from the sale of the Notes of $47,091, after deducting underwriting discounts and commissions and offering expenses of $2,909. The Notes are governed by an indenture (the “Indenture”) between the Company and the Bank of New York Mellon dated August 11, 2016.

The Notes are senior, unsecured obligations of the Company and are equal in right of payment with our existing and future senior, unsecured indebtedness, senior in right of payment to our existing and future indebtedness that is expressly subordinated to the Notes, and effectively subordinated to our existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness. The Notes are structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and (to the extent we are not a holder thereof) preferred equity, if any, of our subsidiaries.

Noteholders may convert their notes at their option only in the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2016, if the last reported sale price per share of our common stock for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price on such trading day; (2) during the five consecutive business days immediately after any five consecutive trading day period (such five consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on our common stock; (4) if we call the Notes for redemption; and (5) at any time from, and including, February 15, 2036 until the close of business on the second scheduled trading day immediately before the maturity date. We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, based on the applicable conversion rate. The initial conversion rate is 45.7603 shares per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $21.85 per share, and is subject to

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adjustment. If a “make-whole fundamental change” occurs on or before August 15, 2021, then we will in certain circumstances increase the conversion rate for a specified period of time.

The Notes are redeemable, in whole or in part, at our option at any time, and from time to time, on or after August 15, 2021, at a cash redemption price equal to the principal amount of the notes to be redeemed, plus accrued and unpaid interest, if any. If a “fundamental change” occurs prior to the stated maturity date, then noteholders may require us to repurchase their Notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any. In addition, the Indenture contains customary terms and covenants and events of default with respect to the Notes.

Pursuant to ASC 470, we have bifurcated the debt and equity components of the Notes. The separation was performed by determining the fair value of a similar debt instrument without the associated equity component. That amount was then deducted from the initial gross proceeds of the Notes to arrive at a residual amount which was allocated to the conversion feature that is classified as equity. The difference between the principal amount of the Notes and estimated fair value of the liability component without the embedded equity component (representing the fair value of the embedded equity component) is recorded as a debt discount and an increase to additional paid in capital on the issuance date of the Notes.

The initial fair value of the indebtedness and the embedded conversion option was $38,334 and $11,666, respectively. The embedded conversion option was recorded in stockholders’ equity and as debt discount, to be subsequently accreted to interest expense over the term of the Notes. The initial purchaser discounts and commissions and offering expenses totaled $2,909 and were allocated between the liability and the equity component in proportion to the allocation of proceeds and accounted for as debt issuance costs and equity issuance costs, respectively. As a result, $2,228 attributable to the indebtedness was recorded as a reduction to the carrying value of the Notes, in accordance with our early adoption of ASU 2015-03 Simplifying the Presentation of Debt Issuance Costs, to be subsequently amortized as interest expense over the term of Notes, and $681 attributable to the equity component was recorded a reduction to additional paid-in-capital in stockholders’ equity.

For the three and nine months ended September 30, 2016, we recognized $558 of interest expense related to the Notes, of which $281 was accrued and will be paid in cash and $277 was non-cash accretion of the debt discounts recorded. The Notes have been classified as long-term debt on our condensed consolidated balance sheet. As of September 30, 2016, the fair value of the Notes was $38,648.

Revolving Credit Facility

We maintain a senior secured credit facilities credit agreement (as amended from time to time) with Silicon Valley Bank and Comerica Bank as Lenders, which is secured primarily by the assets of our operating subsidiaries in the United States and United Kingdom. On August 8, 2016, we entered into an amendment to the credit agreement, which extended its maturity date to April 26, 2018. As amended, the credit facility consists of a revolving credit facility ("Bank Line of Credit") of $55,000 with a sub-facility for letters of credit in the aggregate availability amount of $10,000 and a swingline sub-facility in the aggregate availability amount of $5,000. In addition, the agreement was amended to permit us to make certain cash distributions for interest and other payments due under the Notes, distribute up to $4,000 in aggregate for interest payments on the Notes and up to $1,500 in aggregate for cash payments in connection with any conversions of the Notes. We were in compliance with all the financial and other covenants of the credit facility at September 30, 2016.

On August 31, 2016, we used a portion of the proceeds from the Notes offering to prepay all $19,500 aggregate principal amounts outstanding under the bank line of credit.

For the three and nine months ended September 30, 2016, we recorded interest expense of $143 and $263, respectively. and amounts of $51 and $143, respectively, related to the amortization of loan issuance fees. Our average interest rate on borrowings under the bank line of credit was 4.25%.

As of September 30, 2016, we had $46,558 of unused borrowing capacity under the revolving credit facility which is net of an issued but undrawn letter of credit for $6,000 representing a security deposit on the corporate headquarters and operations facilities lease.

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10.    STOCK-BASED COMPENSATION

As of September 30, 2016, there was a total of 2,004,755 shares of common stock available for future grants under our stock purchase and equity award or incentive plans. The following table summarizes the stock-based compensation expense by financial statement line item, employees and non-employees and type of award:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Cost of revenue	$	44	$	200	$	124	$	517
Research and development	85		374		396		673
Sales and marketing	341		1,672		1,283		3,143
General and administrative	1,057		2,709		3,578		4,530
Total	$	1,527	$	4,955	$	5,381	$	8,863
Employees	$	1,519	$	4,907	$	5,367	$	8,638
Non-employees	8		48		14		225
Total	$	1,527	$	4,955	$	5,381	$	8,863

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Stock options	$	819	$	3,279	$	2,135	$	4,388
Restricted stock	346		—		692		—
Restricted stock units ("RSUs")	262		1,590		2,261		4,259
Employee Stock Purchase Plan	100		86		293		216
Total	$	1,527	$	4,955	$	5,381	$	8,863

The following table summarizes stock option plans activity:

	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (1)
Outstanding at December 31, 2015	3,682,019		$	11.51	5.98	$	31,586
Granted	466,566		14.42
Exercised	(367,328	)	6.27
Expired	(5,771	)	5.73
Forfeited	(33,707	)	10.54
Outstanding at September 30, 2016(2)	3,741,779		$	12.40	6.27	$	22,150
Vested or expected to vest:
At September 30, 2016(2)(3)	3,461,891		$	12.57	6.36	$	19,995
Vested:
At September 30, 2016	1,743,949		$	11.73	5.76	$	11,205

(1) Calculated using the estimated per-share fair market value of our common stock on September 30, 2016 and December 31, 2015, which was $17.78, and $19.74, respectively.

(2) The total includes 993,740 performance-based options at September 30, 2016.

(3) Outstanding options, net of expected forfeitures.

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A summary of RSU and restricted stock activity during the nine months ended September 30, 2016 is as follows:

	RSUs		Shares of Restricted Stock
Outstanding at December 31, 2015	414,001		79,940
Granted	15,101		165,217
Vested (1) (2)	(351,029	)	(26,652	)
Outstanding at September 30, 2016	78,073		218,505

(1) Represents RSUs vested in 2016. These were net settled, which resulted in our withholding of 52,638 RSUs in lieu of withholding taxes during the nine months ended September 30, 2016, and are included in this total.

(2) Represents shares of restricted stock vested in 2016. 8,611 shares were returned to us in lieu of withholding taxes during the nine months ended September 30, 2016 and are reflected as Treasury Stock.

11.     COMMITMENTS AND CONTINGENCIES

Intellectual Property

In the normal course of business, we enter into agreements to obtain the rights to certain intellectual property. These agreements may require an up-front payment, milestone payments and/or royalties. Typically, we have certain rights to cancel these agreements, with notice, without additional payments due other than the amount due at the time of cancellation. As of September 30, 2016, the aggregate amount of these future payments, assuming achievement of applicable milestones and non-cancellation, was $1,418 over a period not less than five years. Royalties ranging from 2% to 10% of net sales may be due on the sales of related products. Some of the agreements contain minimum annual royalty amounts.

In November 2011, we entered into an agreement to purchase certain proprietary technology which could require us to make additional aggregate payments of up to $13,350 should certain milestones be met, including milestones related to regulatory applications and approvals. Cumulative payments under this agreement totaled $1,350 through September 30, 2016. In addition, milestone payments of $500, $2,000 and $4,000 are due upon the achievement of net sales of related products of $10,000, $25,000 and $50,000, respectively. A royalty payment of 7% of net sales of related products may be due until such sales reaches $20,000.

The medical device industry is characterized by frequent claims and litigation, including claims regarding patent and other

intellectual property rights as well as improper hiring practices. We are not aware of any pending or threatened legal proceeding against us that would have a material adverse effect on our business, operating results or financial condition. However, we are a party in multiple legal actions involving claimants seeking various remedies, including monetary damages, and none of the outcomes are certain or entirely within our control.

12.    INCOME TAXES

The provision for income taxes for the three and nine months ended September 30,2016 and 2015 includes both domestic and foreign minimum income taxes and changes in the valuation allowance. For the three months ended September 30,2016 and 2015, the income tax (benefit) expense was $(53) and $83, resulting in an effective tax rate of 0.7% and (0.8)%, respectively. For the nine months ended September 30, 2016 and 2015, income tax expense was $21 and $125, resulting in an effective tax rate of (0.1)% and (0.4)%, respectively. The effective tax rate differs from the statutory rate due to minimum income taxes, permanent differences and changes in valuation allowances.

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13.    NET LOSS PER SHARE

The following table sets forth the computation of basic and diluted loss per share:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net loss per common share:
Net loss	$	(7,910	)	$	(10,215	)	$	(29,193	)	$	(30,722	)
Basic and diluted loss per common share:
Basic and diluted weighted average common shares      outstanding	41,940,370			41,074,245			41,639,609			39,892,068
Basic and diluted loss per common share	$	(0.19	)	$	(0.25	)	$	(0.70	)	$	(0.77	)

The following outstanding Company securities, using the treasury stock method, were excluded from the above computations of net loss per share because their impact would be antidilutive due to the net losses during the three months ended September 30,2016 and 2015:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2016	2015	2016	2015
Stock options	3,741,779	3,750,830	3,741,779	3,750,830
RSUs	78,073	414,001	78,073	414,001
Restricted stock	218,505	79,940	218,505	79,940

As discussed in Note 9, in August 2016, we issued $50,000 aggregate principal amount of Notes. The Notes may be settled, at our election, in cash, shares of our common stock or combination of cash and shares of our common stock. For purposes of calculating the maximum dilutive impact, it is presumed that the Notes will be settled in common stock with the resulting potential common shares included in diluted earnings per share if the effect is more dilutive. The effect of the conversion of Notes is excluded from the calculation of diluted loss per share because the net loss for the three and nine months ended September 30, 2016 causes such securities to be antidilutive.

The potential dilutive effect of these securities is shown in the table below:

	Three Months Ended	Nine Months Ended
	September 30, 2016	September 30, 2016
Conversion of Notes	2,917,165	2,917,165

14.    SEGMENT AND GEOGRAPHICAL CONCENTRATION

Operating segments are defined as components of an enterprise for which separate discrete financial information is available and evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. We manage the business globally within one reporting segment. Segment information is consistent with how management reviews the business, makes investing and resource allocation decisions and assesses operating performance. Products are sold principally in the United States. International revenue represented 22.5% and 23.7% of total revenue for the three and nine months ended September 30, 2016; however, revenue earned in any individual foreign country is below 10% of our consolidated revenue.

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The following table represents total revenue by geographic area, based on the location of the customer:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
United States	$	45,978	$	39,459	$	133,409	$	116,055
International	13,332		15,550		41,434		45,732
Total	$	59,310	$	55,009	$	174,843	$	161,787

We classify sales within the United States into three categories: complex spine pathologies, minimally invasive procedures and degenerative and other conditions. A significant portion of our international revenue is derived from our distributor partners who do not report their product usage at the surgeon or hospital level, which prevents us from providing a specific breakdown for our international revenue among its three product categories. These sales transactions are settled when we ship the product to the agent.

In the fourth quarter of 2015, we refined our reporting of procedure revenue that included the sale of certain single-use MIS products which are sold in support of degenerative surgical procedures as degenerative revenue.  Historically these sales were reflected in the MIS product category.  As a result of this reclassification, our historically reported MIS revenue has decreased and our degenerative revenue has increased $1,057 and $2,358 for the three and nine months ended September 30, 2015 to conform to the current year presentation.

The following table represents domestic revenue by current procedure category:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Complex spine	$	19,516	$	16,852	$	53,981	$	48,204
Minimally invasive	6,767		6,344		20,653		17,766
Degenerative	19,695		16,263		58,775		50,085
	45,978		39,459		133,409		116,055
International	13,332		15,550		41,434		45,732
Total	$	59,310	$	55,009	$	174,843	$	161,787

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ITEM 2.    

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read together with our condensed consolidated financial statements and related notes included elsewhere in this report. This discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. You should review the cautionary statements under the heading “Part I: Item 1A. Risk Factors” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2015 and elsewhere in this Quarterly Report on Form 10-Q and in our other Securities and Exchange Commission filings. Our actual results could differ materially from those contained in or implied by the forward-looking statements. See “Special Note Regarding Forward-Looking Statements” following the Table of Contents for further information regarding forward-looking statements. Certain amounts and percentages in this discussion and analysis have been rounded for convenience of presentation. Unless otherwise noted, the figures in the following discussions are unaudited.

Overview

We are a global medical device company focused on designing, developing and commercializing innovative and proprietary complex spine and minimally invasive spine technologies and techniques. Our complex spine products are used by spine surgeons to treat some of the most difficult and challenging spinal pathologies, such as deformity (primarily scoliosis), trauma and tumor. We believe these procedures typically receive a higher rate of positive insurance coverage and often generate more revenue per procedure as compared to other spine surgery procedures. We have applied our product development expertise in innovating complex spine technologies and techniques to the design, development and commercialization of an expanding number of proprietary MIS products. These proprietary MIS products are designed to allow for less invasive access to the spine and faster patient recovery times compared to traditional open access surgical approaches. We have also leveraged these core competencies in the design, development and commercialization of an increasing number of products for patients suffering from degenerative spinal conditions.

We categorize our revenue in the United States amongst revenue generated from the treatment of complex spine pathologies, treatment using MIS approaches and the treatment of degenerative spinal conditions. We define our complex spine procedures as those that involve the treatment of the most difficult and challenging spinal pathologies, such as deformity (primarily scoliosis), trauma and tumor. We consider MIS procedures as degenerative procedures done through minimally invasive approaches designed to allow for less invasive access to the spine and faster patient recovery times as compared to traditional open access surgical approaches. We categorize degenerative procedures as those involving traditional non-MIS products treating degenerative spinal conditions such as traditional spinal fusions and certain single-use MIS products which are sold in support of degenerative surgical procedures. We report revenue related to the sale of biomaterials as part of our complex spine, MIS and degenerative spine revenue categories. We expect our revenue to continue to be driven by aggregate sales growth in all categories. Our revenue classifications may evolve as we grow our business, continue to commercialize new products, adapt to surgeon preferences and surgical techniques and expand our sales globally.

The primary market for our products has been the United States, including the territory of Puerto Rico, where we sell our products through a hybrid sales organization consisting of direct sales employees and independent sales agencies. As of September 30, 2016, our U.S. sales force consisted of 134 direct sales employees and 94 independent sales agencies, who distribute our products and are compensated through a combination of base salaries, individual and company-based performance bonuses, commissions and equity awards. We do not sell our products through or participate in PODs.

We also market and sell our products internationally in 38 countries. We sell our products directly in certain markets such as the United Kingdom and Germany, use independent agencies in Italy and Canada and through independent distributors in other markets such as Australia, Japan and Spain. For the three and nine months ended September 30, 2016, international sales accounted for approximately 22.5% and 23.7% of our revenue, respectively. As of September 30, 2016, our international sales force consisted of 37 direct sales employees, nine independent agencies and 26 independent distributors. Our independent distributors manage the billing relationship with each hospital in their respective territories and are responsible for servicing the product needs of their surgeon customers. We believe there are significant opportunities for us to increase our presence internationally through the expansion of our distributorship network and the commercialization of additional products and product extensions. During the three and nine months ended September 30, 2016, revenue denominated in currencies other than in U.S. dollars represented less than 10.0% of our consolidated revenue.

Components of our Results of Operations

We manage our business globally within one reportable segment, which is consistent with how our management reviews our business, prioritizes investment and resource allocation decisions and assesses operating performance.

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Revenue

We market and sell spinal implants, disposables and instruments, primarily to hospitals, for use by surgeons to treat patients with spinal pathologies. In the United States and international markets where we have direct employee sales locations, which include the United Kingdom, Ireland, Germany, Austria and Switzerland, we manage and maintain the sales relationships with our hospital customers. In those international markets where we utilize independent distributors, we do not manage or maintain the sales relationships with the hospital customers. We do, however, support our distributor partners by providing product training, medical education and engineering expertise to surgeons practicing in these markets.

In markets where we have a direct presence, we generally assign our surgical sets to our direct sales employees and agency partners. A surgical set typically contains the instruments, including any disposables, and spinal implants necessary to complete a successful surgery. With our support, the direct sales employee maintains the surgical sets and places them with our hospital customers for use by surgeons. We recognize revenue upon receipt of a delivered order confirming that our products have been used in a surgical procedure or following shipment and transfer of title to a hospital that purchases products in advance of the surgery.

In our international markets where we utilize independent distributors, we generally sell our surgical sets and the related spinal implant replenishments to our distributors on pre-agreed business terms. We recognize revenue when the title to the goods and the risk of loss related to those goods are transferred. All such sales to distributors are not subject to contingencies and are, therefore, final. International revenue was 22.5% and 28.3% of total revenue for the three months ended September 30, 2016 and 2015, respectively, compared to 23.7% and 28.3% of total revenue for the nine months ended September 30, 2016 and 2015, respectively.

We generated 57.1% and 58.8% of our U.S. revenue for the three months ended September 30, 2016 and 2015, respectively from the sale of our complex spine and MIS products and 56.0% and 56.8% for the nine months ended September 30, 2016 and 2015, respectively. We expect that these core product categories will continue to be a significant contributor to our revenue growth in the future.

While we believe the proportion of our international revenue from complex spine and MIS is higher than in the United States, a significant portion of our international revenue is derived from our distributor partners who do not report their product usage at the surgeon or hospital level, which prevents us from providing a specific breakdown for our international revenue among our three product categories.

For 2016, we expect an overall decline in our international revenue from our distributors in Australia and Japan when compared to 2015. The expected decrease is a result of factors including the status of our product registrations, changes in distributor management and their approach to inventory management and the impact of anticipated fluctuations in foreign exchange rates relative to the U.S. dollar on instrument and implant purchase decisions. Revenue from distributors in our Asia/Pacific markets, which includes Australia and Japan represented approximately 8.2% and 9.7% for the three months ended September 30, 2016 and 2015, respectively, compared to 5.9% and 8.5% for the nine months ended September 30, 2016 and 2015, respectively.

Cost of Revenue

Except for certain specialty products that we manufacture in-house, our instruments, spinal implants, disposables, instruments and related offerings are manufactured to our specifications by third-party suppliers who meet our manufacturer qualification standards. Our third-party manufacturers meet FDA, International Organization for Standardization (ISO) and other country-specific quality standards supported by our internal specifications and procedures. Substantially all of our suppliers manufacture our products in the United States. Our cost of revenue consists primarily of costs of products purchased from our third-party suppliers, amortization of surgical instruments, inventory reserves, royalties, inbound shipping, inspection and related costs incurred in making our products available for sale or use. Cost of revenue also includes related personnel and consultants' compensation and stock-based compensation expense. Through December 31, 2015, our cost of revenue included the effect of a 2.3% excise tax on the sale of medical devices sold in the United States. Such tax was suspended by the U.S. for a two year period beginning in 2016. We expect our cost of revenue to increase in absolute terms due primarily to increased sales volume and changes in the geographic mix of our sales as our international operations tend to have a higher cost of revenue as a percentage of sales.

Research and Development

Our research and development expenses primarily consist of research and development, engineering, product development, clinical expenses, regulatory expenses, related consulting services, third-party prototyping services, outside research activities, materials production and other costs associated with the design and development of our products. Research and development

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expenses also include related personnel and consultants’ compensation and stock-based compensation expense. We expense research and development costs as they are incurred. We expect to incur additional costs as we continue to design and commercialize new products. While our research and development expense fluctuate from period to period based on the timing of specific research, development and testing initiatives, we generally expect these costs will increase in absolute terms over time as we continue to expand our product portfolio and add related personnel.

Sales and Marketing

Sales and marketing expenses primarily consist of commissions to our independent agencies, as well as compensation, commissions, benefits and other related costs, including stock-based compensation, for personnel employed in our sales, marketing and clinical sales support departments. Sales and marketing also includes the costs of medical education, training, sales related shipping and corporate communications activities. We expect our sales and marketing expenses will increase in absolute terms due to increased sales volume, the continued expansion of our sales force and the continued design and commercialization of new products.

General and Administrative

General and administrative expenses include compensation, benefits and other related costs, including stock-based compensation for personnel employed in our executive management, finance, regulatory, information technology and human resource departments, as well as facility costs and costs associated with consulting and other finance, legal, information technology and human resource services provided by third-parties. We include legal and litigation expenses as well as costs related to the development and protection of our intellectual property portfolio in general and administrative expenses. We expect our general and administrative expenses to continue to increase in absolute dollars as we hire additional personnel to support the growth of our business. In addition, we expect to incur increased expenses as a result of being a public company. General and administrative expenses also include amortization expense of certain of our intangible assets. However, the amortization of such assets is expected to decline over the next several years as such assets subject to amortization become fully amortized based on their estimated useful lives.

Income Tax Provision

We are taxed at the rates applicable within each jurisdiction in which we operate and/or generate revenue. The effective income tax rate, tax provisions, deferred tax assets and deferred tax liabilities will vary according to the jurisdiction in which profits arise. Tax laws are complex and subject to different interpretations by management and the respective governmental taxing authorities, and require us to exercise judgment in determining our income tax provision, our deferred tax assets and liabilities and the valuation allowance recorded against our net deferred tax assets. Deferred tax assets and liabilities are determined using the enacted tax rates in effect for the years in which those tax assets are expected to be realized. A valuation allowance is established when it is more likely than not that the future realization of all or some of the deferred tax assets will not be achieved.

Material Trends and Uncertainties

The global spinal surgery industry has been growing as a result of:

• the increased accessibility of healthcare to more people worldwide;

• advances in technologies for treating conditions of the spine, which have increased the addressable market of patients; and

• overall population growth, aging patient demographics and an increase in life expectancies around the world.

Nonetheless, we face a number of challenges and uncertainties, including:

• ongoing requirements from our hospital partners related to pricing and operating procedures;

• changes in macroeconomic conditions influencing patients to delay elective surgeries;

• continued market acceptance of our new product innovations;

• the unpredictability of government regulation over healthcare in the worldwide markets, including outcome based reimbursement programs in the United States;

• competitive threats in the future displacing current surgical treatment protocols;

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• the impact of industry consolidation on the overall market;

• the unpredictability of foreign currency exchange rates and the exchange impact on independent distributors outside the United States who pay for our products in U.S. dollars;

• competitive threats to our existing surgeon network;

• dependence on our network of direct sales employees, independent sales agencies and international distributors to maintain and expand the level of sales or distribution activity with respect to our products; and

• adverse effects and potential risks associated with the expected exit of the United Kingdom from the European Union such as greater restrictions on imports and exports between the United Kingdom and European Union countries and increased regulatory complexity.

Results of Operations

The following table sets forth, for the periods indicated, our results of operations expressed as dollar amounts:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
	(In thousands)
Revenue	$	59,310		$	55,009		$	174,843		$	161,787
Cost of revenue	19,512			17,390			58,747			53,507
Gross profit	39,798			37,619			116,096			108,280
Operating expenses:
Research and development	5,199			5,154			15,989			14,808
Sales and marketing	27,384			26,808			84,132			79,588
General and administrative	13,312			15,667			41,343			42,575
Total operating expenses	45,895			47,629			141,464			136,971
Loss from operations	(6,097		)	(10,010		)	(25,368		)	(28,691		)
Other expense, net:
Foreign currency transaction loss	(547		)	(12		)	(1,099		)	(1,552		)
Interest expense	(1,319		)	(110		)	(2,705		)	(354		)
Total other expense, net	(1,866		)	(122		)	(3,804		)	(1,906		)
Loss before income tax expense	(7,963		)	(10,132		)	(29,172		)	(30,597		)
Income tax (benefit) expense	(53		)	83			21			125
Net loss	$	(7,910	)	$	(10,215	)	$	(29,193	)	$	(30,722	)

Three Months Ended September 30, 2016 Compared to the Three Months Ended September 30, 2015

The following table sets forth, for the periods indicated, our revenue by geography expressed as dollar amounts and the changes in such revenue between the specified periods expressed in dollar amounts and as percentages:

	Three Months Ended September 30,
	2016		2015		$ Change			% Change
	(In thousands)
United States	$	45,978	$	39,459	$	6,519		16.5	%
International	13,332		15,550		(2,218		)	(14.3	)%
Total revenue	$	59,310	$	55,009	$	4,301		7.8	%

Total revenue increased $4.3 million, or 7.8%, to $59.3 million for the three months ended September 30, 2016 from $55.0 million for the three months ended September 30, 2015. The increase in revenue was primarily driven by $9.8 million in greater sales volume from new surgeon users in the United States, a $1.1 million increase in the United States resulting from new product offerings, partially offset by a decrease in revenue from our existing U.S. customer base, a reduction of revenue in the United Kingdom, and a reduction of international distributor revenue in Australia.

U.S. Revenue

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The following table sets forth, for the periods indicated, our U.S. revenue by product category expressed as dollar amounts and the changes in such revenue between the specified periods expressed in dollar amounts and percentages. In the fourth quarter of 2015, we refined our reporting of procedure revenue that included the sale of certain single-use MIS products which are sold in support of degenerative surgical procedures as degenerative revenue.  Historically, these sales were reflected in the MIS product category.  As a result of this reclassification, our historically reported MIS revenue has decreased and our degenerative revenue has increased by approximately $1.1 million for the three months ended September 30, 2015 to conform to the current year presentation.

	Three Months Ended September 30, 2016
	2016		2015		$ Increase		% Change
	(In thousands)
Complex spine	$	19,516	$	16,852	$	2,664	15.8	%
Minimally invasive	6,767		6,344		423		6.7	%
Degenerative	19,695		16,263		3,432		21.1	%
Total U.S. revenue	$	45,978	$	39,459	$	6,519	16.5	%

U.S. revenue increased $6.5 million, or 16.5%, to $46.0 million for the three months ended September 30, 2016 from $39.5 million for the three months ended September 30, 2015. Sales in our complex spine, MIS and degenerative categories represented 42.4%, 14.7% and 42.9% of U.S. revenue, respectively, for the three months ended September 30, 2016, compared to 42.7%, 16.1% and 41.2% of U.S. revenue, respectively, for the three months ended September 30, 2015. The overall U.S. revenue growth was driven by new surgeon users representing $9.8 million of the revenue change, offset, in part, by unfavorable changes in price and a decrease in existing customer usage. Complex spine growth of $2.7 million primarily reflects increased surgeon usage of our EVEREST^(R) systems of $1.6 million. Minimally invasive growth of $0.4 million primarily reflects surgeon usage of our new CASCADIA^™ interbody devices featuring Lamellar 3D Titanium Technology™ of $1.0 millionand increased usage of our EVERESTminimally invasive products of $0.8 million. Degenerative growth of $3.4 million primarily reflects surgeon usage of our new CASCADIA interbody devices of $2.7 million.

International Revenue

International revenue decreased $2.3 million, or 14.3%, to $13.3 million for the three months ended September 30, 2016 from $15.6 million for the three months ended September 30, 2015. International revenue declined primarily as a result of decreased revenue in the United Kingdom and Australia of $1.5 million.

Cost of Revenue

Cost of revenue increased $2.1 million, or 12.2%, to $19.5 million for the three months ended September 30, 2016 from $17.4 million for the three months ended September 30, 2015. The increase was primarily due to increased sales volume and higher inventory reserve allowance. Instrument amortization expense increased $0.4 million, or 9.9%, to $3.5 million for the three months ended September 30, 2016 from $3.1 million in the three months ended September 30, 2015.

Gross Profit

Gross profit decreased as a percentage of revenue to 67.1% for the three months ended September 30, 2016 from 68.4% for the three months ended September 30, 2015. The decrease in gross profit as a percentage of revenue is primarily due to higher inventory reserve expense and increased instrument amortization expense.

Research and Development

Research and development expenses were $5.2 million for the three months ended September 30, 2016 and 2015, respectively.

Sales and Marketing

Sales and marketing expenses increased $0.6 million, or 2.1%, to $27.4 million for the three months ended September 30, 2016 from $26.8 million for the three months ended September 30, 2015. The increase was primarily due to an increase in sales commissions as a result of increased sales volume, partially offset by lower stock-based compensation expense.

General and Administrative

General and administrative expenses decreased $2.4 million, or 15.0%, to $13.3 million for the three months ended September 30, 2016 from $15.7 million for the three months ended September 30, 2015. The decrease was primarily due to lower stock-based compensation expense and decreased third-party legal expenses. General and administrative expenses

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includes amortization of intangible assets of $2.6 million and $2.5 million for the three months ended September 30, 2016 and 2015, respectively.

Other Expense, net

Other expense, net, increased $1.8 million, to $(1.9) million for the three months ended September 30, 2016 from $(0.1) million for the three months ended September 30, 2015. The increase in other expense, net was primarily attributable to an increase in interest expense of $1.1 million  incurred on the capital lease obligation related to our headquarters and operations facilities and the convertible senior notes dues 2036 (the "Notes"), which were issued in August 2016, and $0.5 million in unrealized losses from foreign currency remeasurement on intercompany payable balances.

Net Loss

Net loss decreased $2.3 million, or 22.6%, to $7.9 million for the three months ended September 30, 2016 from $10.2 million for the three months ended September 30, 2015. The decrease in our net loss was primarily attributable to lower general and administrative expenses associated with stock-based compensation and third-party legal expenses.

Nine Months Ended September 30, 2016 Compared to the Nine Months Ended September 30, 2015

The following table sets forth, for the periods indicated, our revenue by geography expressed as dollar amounts and the changes in such revenue between the specified periods expressed in dollar amounts and as percentages:

	Nine Months Ended September 30,
	2016		2015		$ Change			% Change
	(In thousands)
United States	$	133,409	$	116,055	$	17,354		15.0	%
International	41,434		45,732		(4,298		)	(9.4	)%
Total revenue	$	174,843	$	161,787	$	13,056		8.1	%

Total revenue increased $13.0 million, or 8.1%, to $174.8 million for the nine months ended September 30, 2016 from $161.8 million for the nine months ended September 30, 2015. The increase in revenue was primarily driven by $15.5 million in greater sales volume from new surgeon users in the United States, partially offset by a reduction in revenue in our international markets, primarily Australia, Saudi Arabia, United Kingdom and Japan. The increases in the United States were offset in part by a decrease in revenue from our existing customer base.

U.S. Revenue

The following table sets forth, for the periods indicated, our U.S. revenue by product category expressed as dollar amounts and the changes in such revenue between the specified periods expressed in dollar amounts and percentages. In the fourth quarter of 2015, we refined our reporting of procedure revenue that included the sale of certain single-use MIS products which are sold in support of degenerative surgical procedures as degenerative revenue.  Historically, these sales were reflected in the MIS product category.  As a result of this reclassification, our historically reported MIS revenue has decreased and our degenerative revenue has increased by approximately $2.4 million for the nine months ended September 30, 2015 to conform to the current year presentation.

	Nine Months Ended September 30,
	2016		2015		$ Increase		% Change
	(In thousands)
Complex spine	$	53,981	$	48,204	$	5,777	12.0	%
Minimally invasive	20,653		17,766		2,887		16.3	%
Degenerative	58,775		50,085		8,690		17.4	%
Total U.S. revenue	$	133,409	$	116,055	$	17,354	15.0	%

U.S. revenue increased $17.3 million, or 15.0%, to $133.4 million for the nine months ended September 30, 2016 from $116.1 million for the nine months ended September 30, 2015. Sales in our complex spine, MIS and degenerative categories represented 40.5%, 15.5% and 44.0% of U.S. revenue, respectively, for the nine months ended September 30, 2016, compared to 41.5%, 15.3% and 43.2% of U.S. revenue, respectively, for the nine months ended September 30, 2015. The overall U.S. revenue growth was driven by new surgeon users representing $15.5 million of revenue and from the mix of products sold, offset, in part, by unfavorable changes in price and a decrease in existing customer usage. Complex spine growth of $5.8

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million reflects increased surgeon usage of our EVEREST system of $4.6 million. MIS growth of $2.9 million primarily reflects increased surgeon usage of our EVEREST minimally invasive products of $2.4 million and our new CASCADIA interbody devices of $2.0 million. Degenerative growth of $8.7 million primarily reflects increased surgeon usage of our new CASCADIA interbody devices of $5.9 million, increased usage of our EVEREST product line of $2.9 million, and increased surgeon usage of our biomaterials offering of $2.2 million.    

International Revenue

International revenue decreased $4.3 million, or 9.4%, to $41.4 million for the nine months ended September 30, 2016 from $45.7 million for the nine months ended September 30, 2015. International revenue decreased primarily as a result of reduced investments by our distributor partners in Australia of $2.1 million and Saudi Arabia of $1.5 million as well as a disruption in the registration of our products in Japan of $0.7 million. The decrease was also due in part to declining surgery volumes in the United Kingdom and lower average exchange rates between the U.S. dollar and the British Pound, representing a $1.0 million revenue decrease.

Cost of Revenue

Cost of revenue increased $5.2 million, or 9.8%, to $58.7 million for the nine months ended September 30, 2016 from $53.5 million for the nine months ended September 30, 2015. The increase was primarily due to increased sales volume, inventory reserve allowance, and instrument amortization expense associated with our continued investment in inventory. Instrument amortization expense increased $1.1 million, or 11.0%, to $10.2 million in the nine months ended September 30, 2016 from $9.1 million for the nine months ended September 30, 2015. In addition, the cost of revenue associated with the medical device excise tax in the United States was approximately $(0.9) million representing expected recoveries of over paid taxes and an expense of $1.2 million for the nine months ended September 30, 2016 and 2015, respectively.

Gross Profit

Gross profit decreased as a percentage of revenue to 66.4% for the nine months ended September 30, 2016 from 66.9% for the nine months ended September 30, 2015. The decrease in gross profit as a percentage of revenue is primarily due to increased inventory allowance and higher instrument amortization expense, mostly offset by the suspension of the medical device excise tax.

Research and Development

Research and development expenses increased $1.2 million, or 8.0%, to $16.0 million for the nine months ended September 30, 2016 from $14.8 million for the nine months ended September 30, 2015. The increase was primarily due to higher payroll expense and increased development of products in our product pipeline.

Sales and Marketing

Sales and marketing expenses increased $4.5 million, or 5.7%, to $84.1 million for the nine months ended September 30, 2016 from $79.6 million for the nine months ended September 30, 2015. The increase was primarily due to an increase in sales commissions as a result of the increased sales volume and increased employee compensation costs resulting from our hiring of direct sales employees since June 30, 2014. The increase is also due in part to increased spending on meetings and conferences.

General and Administrative

General and administrative expenses decreased $1.3 million, or 2.9%, to $41.3 million for the nine months ended September 30, 2016 from $42.6 million for the nine months ended September 30, 2015. The decrease was primarily due to lower third-party legal expenses and decreased stock-based compensation. General and administrative expenses included amortization of intangible assets of $7.8 million and $7.7 million in the nine months ended September 30, 2016 and 2015.

Other Expense, net

Other expense, net, increased $1.9 million to $3.8 million for the nine months ended September 30, 2016 from $1.9 million for the nine months ended September 30, 2015. The increase in other expense, net was attributable to an increase in interest expense of $2.3 million incurred on the capital lease obligation and the Notes, partially offset by a $0.5 million decrease in unrealized losses from foreign currency translation on intercompany payable balances.

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Net Loss

Net loss decreased $1.5 million or 5.0% to $29.2 million for the nine months ended September 30, 2016 from $30.7 million for the nine months ended September 30, 2015. The decrease in our net loss was primarily attributable to lower general and administrative expenses associated with third-party legal expenses.

Non-GAAP Financial Measures

Adjusted EBITDA represents net loss plus interest expense, income tax (benefit) expense, depreciation and amortization, stock-based compensation expense and foreign currency transaction loss. Beginning in the fourth quarter of 2016, Adjusted EBITDA will also include a deduction for cash payments made for rent on our headquarters and operations facilities under the capital lease agreement which commences in October 2016.

We present Adjusted EBITDA because we believe it is a useful indicator of our operating performance. Our management uses Adjusted EBITDA principally as a measure of our operating performance and for planning purposes, including the preparation of our annual operating budget and financial projections. We believe that Adjusted EBITDA is useful to investors because it is frequently used by analysts, investors and other interested parties to evaluate companies in our industry. We also believe Adjusted EBITDA is useful to our management and investors as a measure of comparative operating performance from period to period.

Adjusted EBITDA is a non-GAAP financial measure and should not be considered as an alternative to net loss as a measure of financial performance or cash flows from operations as a measure of liquidity, or any other performance measure derived in accordance with GAAP and it should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items. In addition, Adjusted EBITDA is not intended to be a measure of free cash flow for management’s discretionary use, as it does not reflect certain cash requirements such as tax payments, debt service requirements, capital expenditures and certain other cash costs that may recur in the future. Adjusted EBITDA contains certain other limitations, including the failure to reflect our cash expenditures, cash requirements for working capital needs and cash costs to replace assets being depreciated and amortized. In evaluating Adjusted EBITDA, you should be aware that in the future we may incur expenses that are the same as or similar to some of the adjustments in this presentation. Our presentation of Adjusted EBITDA should not be construed to imply that our future results will be unaffected by any such adjustments. Management compensates for these limitations by primarily relying on our GAAP results in addition to using Adjusted EBITDA supplementally. Our definition of Adjusted EBITDA is not necessarily comparable to other similarly titled captions of other companies due to different methods of calculation.

The following table presents a reconciliation of net loss to Adjusted EBITDA for the periods presented:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
	(In thousands)
Net loss	$	(7,910	)	$	(10,215	)	(29,193		)	(30,722		)
Interest expense	1,319			110			2,705			354
Income tax expense	(53		)	83			21			125
Depreciation and amortization	7,415			6,126			21,452			18,396
Stock-based compensation expense	1,527			4,954			5,381			8,863
Foreign currency transaction loss	547			12			1,099			1,552
Adjusted EBITDA	$	2,845		$	1,070		$	1,465		$	(1,432	)

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Liquidity and Capital Resources

On August 11, 2016, we completed the issuance of $50.0 million aggregate principal amount of 4.125% convertible senior Notes due 2036 for which we received net proceeds of approximately $47.1 million. With a portion of these proceeds, we retired all borrowings outstanding under our revolving credit facility of $19.5 million. The remaining net proceeds have been or will be used for general corporate purposes, which may include working capital and purchasing inventory. For further details of the Notes, please refer to “Indebtedness” below.

As of September 30, 2016, we had cash and cash equivalents of $46.1 million as compared to $34.6 million as of December 31, 2015. We had working capital of $120.9 million as of as September 30, 2016 compared to $107.4 million as of December 31, 2015. At September 30, 2016, outstanding long-term indebtedness included the carrying value of the Notes of $36.4 million and the capital lease obligation of $35.2 million. In addition, we had no borrowings outstanding under our credit facility.

Our principal long-term liquidity need is working capital to support the continued growth of our business through the hiring of direct sales employees and partnering with independent sales agencies to expand our global sales force, purchases of additional inventory to support future sales activities, the maintenance of our international operations, and the development and commercialization of new products through our research and development efforts. We expect to fund our long-term capital needs with cash and cash equivalents, cash flows from operations and availability under our revolving credit facility (which may vary due to changes in our borrowing base). In addition, we may obtain additional liquidity to continue to execute our business strategy through the incurrence of additional indebtedness, additional equity financings or a combination of these potential sources of funds.

Although we believe that these sources will provide sufficient liquidity for us to meet our liquidity needs for the foreseeable future, our liquidity and our ability to fund these needs will depend to a significant extent on our future financial performance, which will be subject in part to general economic, competitive, financial, regulatory and other factors that are beyond our control. In addition to these general economic and industry factors, the principal factors determining whether our cash flows will be sufficient to meet our long-term liquidity requirements will be our ability to provide attractive products to our customers, changes in our customers’ ability to obtain third-party coverage and reimbursement for procedures that use our products, increased pricing pressures resulting from intensifying competition, cost increases and slower product development cycles resulting from a changing regulatory environment. If those factors change significantly or other unexpected factors adversely affect us, our business may not generate sufficient cash flow from operations and future financings may not be available on terms acceptable to us or at all to meet our liquidity needs.

In assessing our liquidity, management reviews and analyzes our current cash-on-hand, the average number of days our accounts receivable are outstanding, payment terms that we have established with our vendors, inventory turns, foreign exchange rates, capital expenditure commitments and income tax rates.

We are actively exploring acquisition, investment or strategic partnership opportunities to further enhance our product portfolio or development pipeline for future products. We expect these opportunities may result in additional expense or an increase in intellectual property assets when any such agreements are completed or over the period of development of such technologies.  In some cases, the development period of the technologies and related expense may extend multiple years in advance of revenue generation.

Cash Flows

The following table shows our cash flows from operating, investing and financing activities for the nine months ended September 30,2016 and 2015, respectively:

	Nine Months Ended September 30,
	2016			2015
	(In thousands)
Net cash used in operating activities	$	(14,988	)	$	(13,193	)
Net cash used in investing activities	(22,453		)	(9,557		)
Net cash provided by financing activities	48,837			55,326
Effect of exchange rate on cash	75			(311		)
Net change in cash and cash equivalents	$	11,471		$	32,265

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Cash Used in Operating Activities

Net cash used in operating activities increased $1.8 million to $15.0 million for the nine months ended September 30, 2016 from $13.2 million for the nine months ended September 30, 2015. The increase in net cash used in operations was primarily due to the timing of and increase in payments of accounts payable and accrued and prepaid expenses partially offset by the timing of collection of accounts receivable and a smaller net loss during the nine months ended September 30, 2016.

Cash Used in Investing Activities

Net cash used in investing activities increased $12.9 million to $22.5 million for the nine months ended September 30, 2016 from $9.6 million for the nine months ended September 30, 2015. The increase in net cash used in investing activities was primarily attributable to leasehold build-out costs and investments in furniture and equipment that were placed in service in connection with the transition to our new corporate headquarters and operations facilities and increased purchases of surgical instruments. These cash outlays were partially offset by the use of restricted cash to fund a portion of our leasehold improvements. Cash used from investing activities for the nine months ended September 30, 2016 also included a milestone payment of approximately $1.3 million following the clearance of our CE Marking from the Notified Body (BSI Group) with respect to our RHINE™ cervical arthroplasty solution intended for markets outside the U.S.

Cash Provided by Financing Activities

Net cash provided by financing activities decreased $6.5 million to $48.8 million for the nine months ended September 30, 2016 from $55.3 million for the nine months ended September 30, 2015. During the nine months ended September 30, 2016, we received net proceeds of $47.6 million from our Notes issuance. We generated net proceeds from issuances of common stock of $54.4 million during the nine months ended September 30, 2015.

We used a portion of these proceeds from the issuance of the Notes to repay amounts outstanding under our bank line of credit of $19.5 million.

Capital Expenditures

Our capital expenditures were $27.3 million and $9.0 million for the nine months ended September 30, 2016 and 2015, respectively, consisting primarily of consigned instrumentation to support surgical sales and expansion of our global distribution network and an increase in property, plant and equipment expenditures resulting from the build-out of and move to our new corporate headquarters and operations facilities.

During the nine months ended September 30, 2016, we paid approximately $10.5 million to complete the build-out of leasehold improvements necessary to commence operations at our headquarters and operations facility, including the relocation of our Malvern, Pennsylvania operations and approximately $3.5 million for furniture, fixtures and capital equipment.  These improvements and other capital costs were funded through a combination of escrow amounts (restricted cash) of $6.1 million, cash and cash equivalents and borrowings. During the fourth quarter of 2016, we expect to relocate and expand our sales and operations facility in the United Kingdom as the existing lease expires in January 2017. We expect to incur approximately $1.0 million in capital expenditure and relocation expenses as we make the necessary leasehold improvements and transition our operations to the new facility.

We expect capital expenditures to increase as we purchase additional surgical instruments and continue to expand our global distribution network.

Indebtedness

Convertible Senior Notes

On August 11, 2016, we issued $50.0 million aggregate principal amount of convertible senior notes due 2036 (the “Notes”). The Notes pay interest at an annual rate of 4.125%, payable semi-annually in arrears on February 15 and August 15 of each year beginning on February 15, 2017 and mature on August 15, 2036, unless earlier converted, redeemed or repurchased by us. We received net proceeds from the sale of the Notes of approximately $47.1 million. The Notes are governed by an indenture (the “Indenture”) between the Company and the Bank of the New York Mellon dated August 11, 2016.

The Notes are senior, unsecured obligations of the Company and are equal in right of payment with our existing and future senior, unsecured indebtedness, senior in right of payment to our existing and future indebtedness that is expressly subordinated to the Notes, and effectively subordinated to our existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness. The Notes are structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and (to the extent we are not a holder thereof) preferred equity, if any, of our subsidiaries.

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Noteholders may convert their Notes at their option only in the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2016, if the last reported sale price per share of our common stock for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price on such trading day; (2) during the five consecutive business days immediately after any five consecutive trading day period (such five consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on our common stock; (4) if we call the Notes for redemption; and (5) at any time from, and including, February 15, 2036 until the close of business on the second scheduled trading day immediately before the maturity date. We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, based on the applicable conversion rate. The initial conversion rate is 45.7603 shares per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $21.85 per share, and is subject to adjustment. If a “make-whole fundamental change” occurs on or before August 15, 2021, then we will in certain circumstances increase the conversion rate for a specified period of time.

The Notes are redeemable, in whole or in part, at our option at any time, and from time to time, on or after August 15, 2021, at a cash redemption price equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any.

If a “fundamental change” occurs prior to the stated maturity date, then noteholders may require us to repurchase their Notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any.

The Indenture contains customary terms and covenants and events of default with respect to the Notes. If an event of default (as defined in the Indenture) occurs and is continuing, either the Trustee or the holders of at least 25% in aggregate principal amount of the outstanding Notes may declare the principal amount of Notes to be due and payable immediately by notice to the Company. If an event of default arising out of certain events of bankruptcy, insolvency or reorganization involving the Company or a significant subsidiary (as set forth in the Indenture) occurs with respect to us, the principal amount of the Notes and accrued and unpaid interest, if any, will automatically become immediately due and payable.

We used a potion of the net proceeds of this offering to repay approximately $19.5 million of borrowings under our revolving credit facility and have used or will use the remaining net proceeds for general corporate purposes, which may include working capital and purchasing inventory.

Revolving Credit Facility

We maintain a senior secured credit facilities credit agreement (as amended from time to time) with Silicon Valley Bank and Comerica Bank as Lenders, which is secured primarily by the assets of our operating subsidiaries in the United States and United Kingdom.

On August 8, 2016, we entered into an amendment to the credit agreement, which extended its maturity date to April 26, 2018. As amended, the credit facility consists of a revolving credit facility of $55.0 million with a sub-facility for letters of credit in the aggregate availability amount of $10.0 million and a swingline sub-facility in the aggregate availability amount of $5.0 million. In addition, the agreement was amended to permit us to make certain cash distributions for interest and other payments due under the Notes, distribute up to $4.0 million in aggregate for interest payments on the Notes and up to $1.5 million in aggregate for cash payments in connection with any conversions of the Notes.

If drawn, ABR loans under the revolving credit facility bear interest at a rate per annum equal to ABR, plus 0.75%. LIBOR loans under the revolving credit facility bear interest at a rate per annum equal to the greater of (i) LIBOR, plus 3.0%. The total obligations under the amended credit facility cannot exceed the lesser of (i) the total revolving commitment of $55.0 million or (ii) the borrowing base, which is calculated as (x) 85% of accounts receivable so long as certain of those accounts receivable do not exceed, in the aggregate, 50% of the borrowing base plus (y) 50% of the value of the eligible inventory provided that the contribution of the value of the eligible inventory not exceed the lesser of 40% of the borrowing base or $15.0 million plus (z) up to $7.5 million to the extent the Borrower and its subsidiaries maintain at least $12.5 million on deposit with a lender or an affiliate of a lender. Borrowings under the revolving credit facility remain secured by a first priority lien on substantially all of the Borrower’s personal property assets, including intellectual property.

The revolving credit facility contains various financial covenants and negative covenants with which we must maintain compliance, including a consolidated adjusted quick ratio for K2M, Inc., K2M UK Limited and select subsidiaries not less than 1.20:1.00 as of the last day of any month; restrictive covenants which limits our ability to pay dividends on common stock and make certain investments, and the provision of certain financial reporting and company information as required. We were in compliance with all the financial and other covenants of the credit facility at September 30, 2016.

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As of September 30, 2016, we had approximately $46.6 million of unused borrowing capacity under the revolving credit facility which is net of an issued but undrawn letter of credit for $6.0 million representing a security deposit on the corporate headquarters and operations facilities lease.

Off-Balance Sheet Arrangements

As of September 30, 2016, we had one issued but undrawn letter of credit for $6.0 million representing a security deposit on the corporate headquarters and operations facilities lease.

Critical Accounting Policies and Estimates

The preparation of our condensed consolidated financial statements requires us to make assumptions, estimates and judgments that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities as of the date of the condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Certain of our accounting policies require the application of significant judgment by management in selecting the appropriate assumptions for calculating financial estimates. By their nature, these judgments are subject to an inherent degree of uncertainty. We use historical experience and other assumptions as the basis for our judgments and making these estimates. Because future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Any changes in those estimates will be reflected in our condensed consolidated financial statements as they occur.

Management believes that the accounting estimates employed are appropriate and resulting balances are reasonable; however, actual results could differ from the original estimates, requiring adjustments to these balances in future periods. Our critical accounting policies and estimates are described under Item 7 — Management's Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies and Estimates — of our Annual Report on Form 10-K for the fiscal year ended December 31, 2015. We have reviewed our policies and determined that those policies remain the Company’s critical accounting policies as of and for the three and nine months ended September 30, 2016.

Recently Issued Accounting Pronouncements

Please see "Note 1 - General and Summary of Significant Accounting Policies - Recent Accounting Pronouncements" for additional information.

Deformity Business Seasonality and Other Quarterly Fluctuations in Revenue

Our revenue is typically higher in the late Spring and Summer and in the fourth quarter of our fiscal year, driven by higher sales of our complex spine products, which is influenced by the higher incidence of adolescent surgeries during these periods to coincide with the beginning of summer vacation and holiday periods. In addition, our international revenue fluctuates quarterly based on the timing of product registration, expansion to new markets and product orders from our exclusive international distribution partners.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Overview Regarding Market Risks

We are exposed to various market risks, which may result in potential losses arising from adverse changes in market rates, such as interest rates and foreign exchange rates. We do not enter into derivatives or other financial instruments for trading or speculative purposes and do not believe we are exposed to material market risk with respect to our cash and cash equivalents.

Interest Rate Risk

The interest rate on our recently issued convertible senior notes is fixed therefore we are not exposed to interest rate risk with respect to these notes. However, we are exposed to interest rate risk in connection with any future borrowings under our revolving credit facility, which bears interest at floating rates. For variable rate debt, interest rate changes do not affect the fair value of the debt instrument, but do impact future earnings and cash flows, assuming other factors are held constant. We do not believe that a 10% change in interest rates would have a significant impact on our net loss for the period or on cash flow.

Foreign Exchange Risk

We operate in countries other than the United States, and, therefore, we are exposed to foreign currency risks. In the European markets where we manage billing relationships, we transact our business in local currencies, which are comprised primarily of Pounds Sterling and the Euro. As of September 30, 2016, revenue denominated in currencies other than U.S. Dollars represented less than 10% of our total revenue. Operating expenses related to these sales are largely denominated in the same respective currency, thereby limiting our transaction risk exposure. We therefore believe that the risk of an impact on our

32

operating income from foreign currency fluctuations is not significant. In addition, we have intercompany foreign transactions between our subsidiaries, which are denominated in currencies other than their functional currency. Fluctuations from the beginning to the end of any given reporting period result in the re-measurement of our intercompany foreign transactions generating transaction gains or losses in the respective period and are reported in total other income (expense), net in our consolidated financial statements.

We recorded a foreign currency transaction loss of $0.5 million and $12.0 thousand in the three months ended September 30, 2016 and 2015, respectively, compared to $1.1 million and $1.6 million during the nine months ended months ended September 30, 2016 and 2015, respectively.

The monetary assets and liabilities of our foreign subsidiaries denominated in other currencies are translated into U.S. dollars at each balance sheet date resulting in a foreign currency translation adjustment reflected in accumulated other comprehensive loss. Within other comprehensive loss, we recorded foreign currency translation adjustment (loss) income of $(0.6) million and $(1.0) million in the three months ended September 30, 2016 and 2015, respectively, and $(2.8) and $0.7 million during the nine months ended September 30, 2016 and 2015, respectively.

Our contracts with foreign distributors are denominated and settled in U.S. dollars. Such foreign distributors are impacted by foreign currency fluctuations which in turn may impact their ability to pay us in a timely manner. Revenue from such customers approximated 13.8% and 14.3% of our revenue for the three and nine months ended September 30, 2016 and represented 32.7% of our net outstanding accounts receivable at September 30, 2016.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures (as that term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act)) that are designed to ensure that information required to be disclosed in our reports under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer (CEO) and our Chief Financial Officer (CFO), as appropriate, to allow timely decisions regarding required disclosures. Any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives.

Our management, with the participation of our CEO and CFO, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act), as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on such evaluation, our CEO and CFO have concluded that as of such date, our disclosure controls and procedures were effective at a reasonable assurance level.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the three month period covered by this quarterly report on Form 10-Q that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II: OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

The medical device industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. We are not aware of any pending or threatened legal proceeding against us that we expect would have a material adverse effect on our business, operating results or financial condition. However, we are a party in multiple legal actions involving claimants seeking various remedies, including monetary damages and none of the outcomes are certain or entirely within our control.

ITEM 1A.    RISK FACTORS

There have been no material changes to the Risk Factors as previously disclosed in Item 1A of our Annual Report on Form 10-K for the fiscal year ended December 31, 2015 which is accessible on the SEC's website at www.SEC.gov.

ITEM 2.    UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a) Sales of Unregistered Securities

During the period July 1, 2016 to September 30, 2016, we issued an aggregate of 2,168 shares of our common stock under the 2010 independent agent stock option plan to agents or other non-employees upon exercise of stock options for aggregate consideration of approximately $20 thousand.

Unless otherwise stated, the sales of the above securities were deemed to be exempt from registration under the Securities Act in reliance upon Section 4(2) of the Securities Act or Regulation D promulgated thereunder, or Rule 701 promulgated under Section 3(b) of the Securities Act as transactions by an issuer not involving any public offering. Individuals who purchased securities as described above represented their intention to acquire the securities for investment only and not with a view to or for sale in connection with any distribution thereof, and appropriate legends were affixed to the share certificates issued in such transactions.

On August 11, 2016, we issued $50.0 million aggregate principal amount of 4.125% convertible senior notes in a private offering. As explained in Note 9 to the financial statements, Debt - Convertible Senior Notes, the notes are convertible into shares of our common stock under certain circumstances. We received net proceeds of approximately $47.1 million after deducting the initial purchaser’s discount and the estimated issuance costs of approximately $2.9 million The Notes will pay interest semi-annually in cash on February 15 and August 15 of each year, commencing February 15, 2017. These will mature on August 15, 2036, unless earlier converted or redeemed or repurchased by us.

Noteholders may convert their Notes at their option only in the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2016, if the last reported sale price per share of our common stock for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price on such trading day; (2) during the five consecutive business days immediately after any five consecutive trading day period (such five consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on our common stock; (4) if we call the Notes for redemption; and (5) at any time from, and including, February 15, 2036 until the close of business on the second scheduled trading day immediately before the maturity date. We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, based on the applicable conversion rate. The initial conversion rate is 45.7603 shares per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $21.85 per share, and is subject to adjustment. If a “make-whole fundamental change” occurs on or before August 15, 2021, then we will in certain circumstances increase the conversion rate for a specified period of time.

The Notes were sold to qualified institutional buyers in reliance on Rule 144A under the securities Act of 1933, as amended. We used a portion of the net proceeds from the Notes issuance to repay approximately $19.5 million of borrowings under our revolving credit facility. We have used or expect to use the remaining net proceeds for general corporate purposes, which may include working capital and purchases of inventory.

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ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.    MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5.    OTHER INFORMATION

None.

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ITEM 6.    EXHIBITS

The agreements and other documents filed as exhibits to this report are not intended to provide factual information or other disclosure other than with respect to the terms of the agreements or other documents themselves, and you should not rely on them for that purpose. In particular, any representations and warranties made by us in these agreements or other documents were made solely within the specific context of the relevant agreement or document and may not describe the actual state of affairs as of the date they were made or at any other time.

4.1 Indenture, dated August 11, 2016, between K2M Group Holdings, Inc. and The Bank of New York Mellon, as trustee (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the Commission on August 11, 2016 (File No. 001-36443)).

4.2 Form of 4.125% Convertible Senior Notes (included as Exhibit A in Exhibit 4.1) (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the Commission on August 11, 2016 (File No. 001-36443)).

10.1 Ninth Amendment dated August 8, 2016 to Credit Agreement dated October 29, 2012, by and among K2M Holdings, Inc., as the guarantor, K2M, Inc. and K2M UK Limited, as borrowers, and Silicon Valley Bank and Comerica Bank as lenders. (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the Commission on August 8, 2016 (File No. 001-36443)).

31.1    Certification of Periodic Report by Chief Executive Officer under Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).

31.2    Certification of Periodic Report by Chief Financial Officer under Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).

32.1    Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (filed herewith).

32.2    Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (filed herewith).

101.INS XBRL Instance Document (filed herewith).

101.SCH XBRL Taxonomy Extension Schema Document (filed herewith).

101.CAL XBRL Taxonomy Extension Calculation Linkbase Document (filed herewith).

101.DEF XBRL Taxonomy Extension Definition Linkbase Document (filed herewith).

101.LAB XBRL Taxonomy Extension Label Linkbase Document (filed herewith).

101.PRE XBRL Taxonomy Extension Presentation Linkbase Document (filed herewith).

36

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	K2M Group Holdings, Inc. (Registrant)
November 2, 2016	By:	/s/ ERIC D. MAJOR
		Name:	Eric D. Major
		Title:	President and Chief Executive Officer
	By:	/s/ GREGORY S. COLE
		Name:	Gregory S. Cole
		Title:	Chief Financial Officer

37

EXHIBIT INDEX

4.1Indenture, dated August 11, 2016, between K2M Group Holdings, Inc. and The Bank of New York Mellon, as trustee (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the Commission on August 11, 2016 (File No. 001-36443)).

4.2 Form of 4.125% Convertible Senior Notes (included as Exhibit A in Exhibit 4.1) (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the Commission on August 11, 2016 (File No. 001-36443)).

10.1 Ninth Amendment dated August 8, 2016 to Credit Agreement dated October 29, 2012, by and among K2M Holdings, Inc., as the guarantor, K2M, Inc. and K2M UK Limited, as borrowers, and Silicon Valley Bank and Comerica Bank as lenders. (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the Commission on August 8, 2016 (File No. 001-36443)).

31.1    Certification of Periodic Report by Chief Executive Officer under Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).

31.2    Certification of Periodic Report by Chief Financial Officer under Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).

32.1    Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (filed herewith).

32.2    Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (filed herewith).

101.INS XBRL Instance Document (filed herewith).

101.SCH XBRL Taxonomy Extension Schema Document (filed herewith).

101.CAL XBRL Taxonomy Extension Calculation Linkbase Document (filed herewith).

101.DEF XBRL Taxonomy Extension Definition Linkbase Document (filed herewith).

101.LAB XBRL Taxonomy Extension Label Linkbase Document (filed herewith).

101.PRE XBRL Taxonomy Extension Presentation Linkbase Document (filed herewith).

38

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Eric D. Major, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of K2M Group Holdings, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 2, 2016

/s/ Eric D. Major

Name: Eric D. Major

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Gregory S. Cole, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of K2M Group Holdings, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 2, 2016

/s/ Gregory S. Cole

Name: Gregory S. Cole

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION OF PERIODIC FINANCIAL REPORTS

I, Eric D. Major, President and Chief Executive Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: 

(1) the Quarterly Report on Form 10-Q for the quarter ended September 30, 2016, (the “Periodic Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of K2M Group Holdings, Inc.

Date: November 2, 2016

/s/ Eric D. Major

Name: Eric D. Major

President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION OF PERIODIC FINANCIAL REPORTS

I, Gregory S. Cole, Chief Financial Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Quarterly Report on Form 10-Q for the Quarter ended September 30, 2016 (the “Periodic Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of K2M Group Holdings, Inc.

Date: November 2, 2016

/s/ Gregory S. Cole

Name: Gregory S. Cole

Chief Financial Officer

XML

DOCUMENT AND ENTITY INFORMATION DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
	Sep. 30, 2016	Oct. 27, 2016
Entity [Abstract]
Entity Registrant Name	K2M Group Holdings, Inc.
Entity Central Index Key	0001499807
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		42,197,647

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 46,117	$ 34,646
Accounts receivable, net	43,215	38,773
Inventory, net	66,737	62,002
Prepaid expenses and other current assets	6,443	19,820
Total current assets	162,512	155,241
Property, plant and equipment, net	51,021	38,318
Goodwill	121,814	121,814
Intangible assets, net	25,340	33,123
Other assets, net	30,579	26,016
Total assets	391,266	374,512
Current liabilities:
Current maturities under capital lease obligation	937	284
Accounts payable	14,528	22,483
Accrued expenses	13,789	13,559
Accrued payroll liabilities	12,318	11,507
Total current liabilities	41,572	47,833
Convertible senior notes	36,383	0
Capital lease obligation, net of current maturities	35,187	34,140
Deferred income taxes, net	5,009	5,042
Other liabilities	820	835
Total liabilities	118,971	87,850
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 750,000,000 shares authorized; 42,206,258 and 41,337,692 shares issued and 42,197,647 and 41,337,692 shares outstanding, respectively.	42	41
Additional paid-in capital	471,915	454,153
Accumulated deficit	(198,614)	(169,421)
Accumulated other comprehensive (loss) income	(914)	1,889
Treasury stock, at cost, 8,611 and 0 shares, respectively.	(134)	0
Total stockholders’ equity	272,295	286,662
Total liabilities and stockholders’ equity	$ 391,266	$ 374,512

XML

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par value per share (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	42,206,258	41,337,692
Common stock, shares outstanding (in shares)	42,197,647	41,337,692
Treasury stock, (in shares)	8,611	0

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 59,310	$ 55,009	$ 174,843	$ 161,787
Cost of revenue	19,512	17,390	58,747	53,507
Gross profit	39,798	37,619	116,096	108,280
Operating expenses:
Research and development	5,199	5,154	15,989	14,808
Sales and marketing	27,384	26,808	84,132	79,588
General and administrative	13,312	15,667	41,343	42,575
Total operating expenses	45,895	47,629	141,464	136,971
Loss from operations	(6,097)	(10,010)	(25,368)	(28,691)
Other expense, net:
Foreign currency transaction loss	(547)	(12)	(1,099)	(1,552)
Interest expense	(1,319)	(110)	(2,705)	(354)
Total other expense, net	(1,866)	(122)	(3,804)	(1,906)
Loss before income taxes	(7,963)	(10,132)	(29,172)	(30,597)
Income tax (benefit) expense	(53)	83	21	125
Net loss	$ (7,910)	$ (10,215)	$ (29,193)	$ (30,722)
Basic and diluted (in dollars per share)	$ (0.19)	$ (0.25)	$ (0.70)	$ (0.77)
Weighted average shares outstanding:
Basic and diluted (in shares)	41,940,370	41,074,245	41,639,609	39,892,068

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,910)	$ (10,215)	$ (29,193)	$ (30,722)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(608)	(951)	(2,803)	719
Other comprehensive (loss) income	(608)	(951)	(2,803)	719
Comprehensive loss	$ (8,518)	$ (11,166)	$ (31,996)	$ (30,003)

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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance (in shares) at Dec. 31, 2015	41,337,692	41,337,692
Beginning Balance at Dec. 31, 2015	$ 286,662	$ 41	$ 454,153	$ (169,421)	$ 1,889
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(29,193)			(29,193)
Other comprehensive loss	(2,803)				(2,803)
Stock-based compensation expense	5,381		5,381
Convertible senior notes equity conversion option	11,666		11,666
Debt issuance costs allocated to equity	$ (680)		(680)
Issuances and exercise of stock-based compensation benefit plans, net of income tax (in shares)	367,328	859,955
Issuances and exercise of stock-based compensation benefit plans, net of income tax	$ 1,262	$ 1	1,395			$ (134)
Ending Balance (in shares) at Sep. 30, 2016	42,197,647	42,197,647
Ending Balance at Sep. 30, 2016	$ 272,295	$ 42	$ 471,915	$ (198,614)	$ (914)	$ (134)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net loss	$ (29,193)	$ (30,722)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	21,452	18,396
Provision for allowance for doubtful accounts	(18)	177
Provision for inventory reserves	2,817	1,128
Stock-based compensation expense	5,381	8,863
Accretion of discounts and amortization of issuance costs of convertible senior notes	558	0
Deferred income taxes	(33)	0
Changes in operating assets and liabilities:
Accounts receivable	(5,292)	(7,729)
Inventory	(6,466)	(6,839)
Prepaid expenses and other assets	(7,636)	(5,262)
Accounts payable, accrued expenses, and accrued payroll liabilities	3,442	8,795
Net cash used in operating activities	(14,988)	(13,193)
Investing activities
Purchase of surgical instruments	(10,986)	(6,595)
Purchase of property, plant and equipment	(16,338)	(2,424)
Changes in cash restricted for leasehold improvements	6,153	0
Purchase of intangible assets	(1,282)	(538)
Net cash used in investing activities	(22,453)	(9,557)
Financing activities
Borrowings on bank line of credit	19,500	25,000
Payments on bank line of credit	(19,500)	(25,000)
Proceeds from issuance of convertible senior notes, net of issuance costs	47,575	0
Proceeds from issuances of common stock, net of issuance costs	0	54,401
Issuances and exercise of stock-based compensation benefit plans, net of income tax	1,262	925
Net cash provided by financing activities	48,837	55,326
Effect of exchange rate changes on cash and cash equivalents	75	(311)
Net increase in cash and cash equivalents	11,471	32,265
Cash and cash equivalents at beginning of period	34,646	11,411
Cash and cash equivalents at end of period	46,117	43,676
Significant non-cash investing and financing activities
Leasehold improvements, including property under capital lease	598	0
Deferred convertible senior notes issuance costs	486	0
Common stock offering costs	0	244
Cash paid for:
Income taxes	177	93
Interest	$ 339	$ 91

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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

In this Quarterly Report on Form 10-Q, unless the context otherwise requires, references to “K2M,” “the Company,” “we,” “us” and “our,” refer to K2M Group Holdings, Inc. together with its consolidated subsidiaries.

We are a global medical device company focused on designing, developing and commercializing innovative complex spine and minimally invasive technologies and techniques. Our complex spine products are used by spine surgeons to treat some of the most difficult and challenging spinal pathologies, such as deformity (primarily scoliosis), trauma and tumor. We have applied our product development expertise in innovating complex spine technologies and techniques to the design, development, and commercialization of an expanding number of proprietary minimally invasive surgery, or MIS, products. Our MIS products are designed to allow for less invasive access to the spine and faster patient recovery times as compared to traditional open access surgical approaches for both complex spine and degenerative spine pathologies. We have leveraged these core competencies in the design, development and commercialization of an increasing number of products for patients suffering from degenerative spinal conditions.

Unaudited Interim Results

The accompanying condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015, the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive loss for the three and nine months ended September 30,2016 and 2015, the condensed consolidated statement of changes in stockholders’ equity as of September 30, 2016, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2016 and 2015 are unaudited. The unaudited interim consolidated financial statements have been prepared on the same basis of accounting as the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include normal recurring adjustments, necessary to present fairly our financial position and results of operations and cash flows for the periods presented. The results for the three and nine months ended September 30, 2016 are not necessarily indicative of future results. All information as of September 30, 2016 and for the three and nine month periods ending September 30, 2016 and 2015 within these notes to the condensed consolidated financial statements is unaudited.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and all of its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States or US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Net Loss per Share

Basic net loss per common share is determined by dividing the net loss allocable to common stockholders by the weighted average number of common shares outstanding during the periods presented, without consideration of common stock equivalents. Diluted loss per share is computed by dividing the net loss allocable to common stockholders by the weighted average number of shares of common stock and common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of our stock option grants and the if-converted method is used to determine the dilutive effect of the convertible senior notes. The weighted average shares used to calculate both basic and diluted loss per share are the same because common stock equivalents were excluded in the calculation of diluted loss per share because their effect would be anti-dilutive. Although included in our outstanding shares total as of September 30, 2016, shares of restricted stock contingently issuable until their restrictions lapse and have been excluded from the weighted average shares outstanding.

Foreign Currency Translation and Other Comprehensive Loss

Our results of operations and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. Our reporting currency is the U.S. dollar, which is also the functional currency of our domestic entities, while the functional currency of our foreign subsidiaries are the British Pound, Euro and Swiss Franc. Assets and liabilities denominated in foreign currencies are translated at the rate of exchange on the balance sheet date. Revenues and expenses are translated using the average exchange rate for the period. Net gains and losses resulting from the translation of foreign financial statements are recorded in other comprehensive income (loss). Net foreign currency gains or losses resulting from transactions in currencies other than the functional currencies are included in other expense, net on the consolidated statements of operations.

Recent Accounting Pronouncements

We qualify as an “emerging growth company” (EGC) pursuant to the provisions of the JOBS Act and elected to take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act which permits EGCs to defer compliance with new or revised accounting standards (the EGC extension) until non-issuers are required to comply with such standards. Accordingly, so long as we continue to qualify as an EGC, we will not have to adopt or comply with new or revised accounting standards until non-issuers are required to comply with such standards.

In March 2016, the Financial Accounting Standards Board, or FASB issued ASU 2016-06, Contingent Put and Call Options in Debt Instruments (Topic 815), which addressesthe accounting for embedded derivatives related to debt contracts. The update clarifies that determining whether the economic characteristics of a put or call are clearly and closely related to its debt host requires only an assessment of the four-step decision sequence. It also indicates that entities are not required to separately assess whether the contingency itself is clearly and closely related. For public entities the guidance will be effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. The guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of the initial application. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance. We are currently assessing the impact of this guidance.

In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which addresses principal versus agent considerations, reporting revenue gross versus net in the new revenue recognition standard. The guidance clarifies how an entity should evaluate the unit of accounting to determine whether it is a specified good or service and how it should apply the control principle to certain types of arrangements. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. The guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of the initial application. We are currently assessing the impact of this guidance.

In March 2016, the FASB issued ASU No. 2016-09, Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which is intended to improve employee share-based payment accounting for companies that issue share-based awards to their employees. This guidance simplifies the accounting for share-based payment transactions, including consequences of income tax award, classification as either equity or liability, treatment of forfeitures, and classification on statement of cash flows. The recognition, measurement and reporting for share-based payments will be affected by this new guidance. For public entities other than EGCs that have elected the EGC extension, the guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance, but all of the guidance must be adopted in the same period. We are currently evaluating the impact of this guidance.

In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which includesfinal amendments to clarify the guidance on identifying performance obligations and accounting for licenses of intellectual property ("IP") in its new revenue recognition standard. The amendment allows entities to disregard goods or services that are immaterial in the context of a contract, assess whether the performance obligation is separately identifiable and whether the shipping and handling activities are a promised service in a contract. This guidance also clarifies how an entity should evaluate the nature of its promise in granting an IP license and when a promised good or service is distinct within the context of a contract. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. We are currently assessing the impact of this guidance.

In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, which clarifies that for a contract to be considered completed the entity should evaluate the collectability threshold or probability of collecting revenue. It provides that the fair value of noncash consideration such as equity should be measured at contract inception when determining the transaction price and any subsequent changes must be recorded as a gain or loss, not as revenue. The entity has the option to make an accounting policy election to exclude from the transaction price certain types of taxes such as sales tax, value-added tax and excise tax in lieu of evaluating such taxes they collect in all jurisdictions to determine whether a tax is levied to the entity or the customer. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. We are currently assessing the impact of this guidance.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This guidance eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees, and beneficial interests obtained in a financial asset securitization. It also provides clarifications related to separately identifiable cash-flows and application of the predominance principle based on evaluating the source and nature of the underlying cash flows when determining whether it is a financing, investing, operating or a combination of cash flow classifications. For public entities the guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance, but all of the guidance must be adopted in the same period. We are currently assessing the impact of this guidance.

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ACCOUNTS RECEIVABLE

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE

The following table summarizes the accounts receivables, net of allowances:

	September 30, 2016			December 31, 2015
Accounts receivable	$	45,395		$	41,210
Allowances	(2,180		)	(2,437		)
Accounts receivable, net	$	43,215		$	38,773

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INVENTORY

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

INVENTORY

INVENTORY

The following table summarizes the inventory, net of allowances:

	September 30, 2016			December 31, 2015
Finished goods	$	99,478		$	90,226
Inventory allowances	(32,741		)	(28,224		)
Inventory, net	$	66,737		$	62,002

Inventory includes surgical instruments available for sale with a carrying value of $10,499 and $8,946 at September 30, 2016 and December 31, 2015, respectively.

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PREPAID AND OTHER CURRENT ASSETS (Notes)

9 Months Ended

Sep. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

PREPAIDS AND OTHER CURRENT ASSETS

PREPAID EXPENSES AND OTHER CURRENT ASSETS

The following table summarizes prepaid expenses and other current assets:

	September 30, 2016		December 31, 2015
Restricted cash	$	517	$	6,669
Landlord incentives for leasehold improvements	—		6,454
Prepaid expenses	2,522		2,408
Other	3,404		4,289
Total	$	6,443	$	19,820

Restricted cash represents funds designated for tenant improvements related to the new headquarters and operations facilities.

Landlord incentives for leasehold improvements represents incentives to be provided by the Landlord of our new headquarters and operations facilities under the capital lease agreement, which commenced in October 2015. Such incentives were received from our landlord upon the completion of actual improvements.

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PROPERTY, PLANT AND EQUIPMENT (Notes)

9 Months Ended

Sep. 30, 2016

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

The following table summarizes property, plant and equipment:

	Estimated Useful Lives	September 30, 2016			December 31, 2015
Buildings under capital lease	16 years	$	26,469		$	26,469
Leasehold improvements, including property under capital lease	15 years	19,317			9,717
Equipment	3-5 years	3,754			3,054
Software	3 years	4,644			4,231
Computer equipment	3 years	1,050			1,493
Furniture and office equipment	5-7 years	3,678			1,050
Vehicles and other	3 years	749			795
Total		59,661			46,809
Less accumulated depreciation and amortization		(8,640		)	(8,491		)
Property, plant and equipment, net		$	51,021		$	38,318

Depreciation and amortization expense for property, plant and equipment was $1,374 and $423 for the three months ended September 30, 2016 and 2015, respectively, and $3,526 and $1,513 for the nine months ended September 30, 2016 and 2015, respectively. Included in this total is amortization expense for buildings under capital lease, for which occupancy commenced in October 2015, of $416 and $1,247 for the three and nine months ended September 30, 2016. Interest expense on the capital lease obligation was $554 and $1,700 for the three and nine months ended September 30, 2016.

As of September 30, 2016 and December 31, 2015, we had leasehold improvements of approximately $18,745 and $8,242, respectively, for our new headquarters and operations facilities which were completed and placed in service in May 2016, following our occupancy of the new premises. Furniture and equipment at September 30, 2016 includes $4,059 of furniture and other capital equipment acquired for use in our new headquarters and operations facilities, which we began to depreciate in May 2016.

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INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

Intangible assets, net comprise the following:

	September 30, 2016
	Estimated Useful Lives	Gross		Accumulated Amortization			Net
Indefinite-lived intangible assets:
Trademarks	—	$	12,900	$	—		$	12,900
In-process research and development	—	900		—			900
Other	—	233		—			233
Subtotal		14,033		—			14,033
Subject to amortization
Developed technology	4 - 6 years	62,000		(56,581		)	5,419
Licensed technology	4 - 6 years	52,600		(52,437		)	163
Customer relationships	4 - 7 years	29,700		(25,988		)	3,712
Patents and other	2 - 17 years	3,277		(1,264		)	2,013
Subtotal		147,577		(136,270		)	11,307
Intangible assets, net		$	161,610	$	(136,270	)	$	25,340

	December 31, 2015
	Estimated Useful Lives	Gross		Accumulated Amortization			Net
Indefinite-lived intangible assets:
Trademarks	—	$	12,900	$	—		$	12,900
In-process research and development	—	900		—			900
Other	—	266		—			266
Subtotal		14,066		—			14,066
Subject to amortization
Developed technology	4 - 6 years	62,000		(52,243		)	9,757
Licensed technology	4 - 6 years	52,600		(52,325		)	275
Customer relationships	4 - 7 years	29,700		(22,805		)	6,895
Patents and other	2 - 17 years	3,245		(1,115		)	2,130
Subtotal		147,545		(128,488		)	19,057
Intangible assets, net		$	161,611	$	(128,488	)	$	33,123

Amortization expense of intangible assets was $2,594 and $2,560 for the three months ended September 30,2016 and 2015, respectively, and $7,781 and $7,733 for the nine months ended September 30,2016 and 2015, respectively.

As of September 30, 2016, the expected amortization expense for the remainder of 2016 and the following four years and thereafter is as follows:

	September 30, 2016
2016	$	2,594
2017	6,763
2018	267
2019	257
2020	232
Thereafter	1,194
Total	$	11,307

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OTHER ASSETS

9 Months Ended

Sep. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

OTHER ASSETS

OTHER ASSETS

Other assets consist of the following:

	September 30, 2016		December 31, 2015
Surgical instruments, net	$	26,936	$	23,945
Restricted cash	2,411		1,298
Other	1,232		773
Total	$	30,579	$	26,016

Surgical instruments are stated net of accumulated amortization and allowances of $31,603 and $26,609 at September 30, 2016 and December 31, 2015, respectively. Amortization expense was $2,517 and $2,304 for the three months ended September 30,2016 and 2015, respectively, and $7,431 and $6,688 for the nine months ended September 30,2016 and 2015, respectively.

Restricted cash balances includes deposits made on pending bids or contracts with customers.

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ACCRUED EXPENSES

9 Months Ended

Sep. 30, 2016

Payables and Accruals [Abstract]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consist of the following:

	September 30, 2016		December 31, 2015
Accrued commissions	$	5,834	$	5,336
Accrued royalties	3,081		2,704
Other	4,874		5,519
Total	$	13,789	$	13,559

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DEBT (Notes)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

DEBT

DEBT

Convertible Senior Notes

On August 11, 2016, we issued $50,000 aggregate principal amount of convertible senior notes (the “Notes”). The Notes pay interest at an annual rate of 4.125%, payable semi-annually in arrears on February 15 and August 15 of each year beginning on February 15, 2017 and mature on August 15, 2036, unless earlier converted, redeemed or repurchased by us. We received net proceeds from the sale of the Notes of $47,091, after deducting underwriting discounts and commissions and offering expenses of $2,909. The Notes are governed by an indenture (the “Indenture”) between the Company and the Bank of New York Mellon dated August 11, 2016.

The Notes are senior, unsecured obligations of the Company and are equal in right of payment with our existing and future senior, unsecured indebtedness, senior in right of payment to our existing and future indebtedness that is expressly subordinated to the Notes, and effectively subordinated to our existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness. The Notes are structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and (to the extent we are not a holder thereof) preferred equity, if any, of our subsidiaries.

Noteholders may convert their notes at their option only in the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2016, if the last reported sale price per share of our common stock for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price on such trading day; (2) during the five consecutive business days immediately after any five consecutive trading day period (such five consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on our common stock; (4) if we call the Notes for redemption; and (5) at any time from, and including, February 15, 2036 until the close of business on the second scheduled trading day immediately before the maturity date. We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, based on the applicable conversion rate. The initial conversion rate is 45.7603 shares per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $21.85 per share, and is subject to adjustment. If a “make-whole fundamental change” occurs on or before August 15, 2021, then we will in certain circumstances increase the conversion rate for a specified period of time.

The Notes are redeemable, in whole or in part, at our option at any time, and from time to time, on or after August 15, 2021, at a cash redemption price equal to the principal amount of the notes to be redeemed, plus accrued and unpaid interest, if any. If a “fundamental change” occurs prior to the stated maturity date, then noteholders may require us to repurchase their Notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any. In addition, the Indenture contains customary terms and covenants and events of default with respect to the Notes.

Pursuant to ASC 470, we have bifurcated the debt and equity components of the Notes. The separation was performed by determining the fair value of a similar debt instrument without the associated equity component. That amount was then deducted from the initial gross proceeds of the Notes to arrive at a residual amount which was allocated to the conversion feature that is classified as equity. The difference between the principal amount of the Notes and estimated fair value of the liability component without the embedded equity component (representing the fair value of the embedded equity component) is recorded as a debt discount and an increase to additional paid in capital on the issuance date of the Notes.

The initial fair value of the indebtedness and the embedded conversion option was $38,334 and $11,666, respectively. The embedded conversion option was recorded in stockholders’ equity and as debt discount, to be subsequently accreted to interest expense over the term of the Notes. The initial purchaser discounts and commissions and offering expenses totaled $2,909 and were allocated between the liability and the equity component in proportion to the allocation of proceeds and accounted for as debt issuance costs and equity issuance costs, respectively. As a result, $2,228 attributable to the indebtedness was recorded as a reduction to the carrying value of the Notes, in accordance with our early adoption of ASU 2015-03 Simplifying the Presentation of Debt Issuance Costs, to be subsequently amortized as interest expense over the term of Notes, and $681 attributable to the equity component was recorded a reduction to additional paid-in-capital in stockholders’ equity.

For the three and nine months ended September 30, 2016, we recognized $558 of interest expense related to the Notes, of which $281 was accrued and will be paid in cash and $277 was non-cash accretion of the debt discounts recorded. The Notes have been classified as long-term debt on our condensed consolidated balance sheet. As of September 30, 2016, the fair value of the Notes was $38,648.

Revolving Credit Facility

We maintain a senior secured credit facilities credit agreement (as amended from time to time) with Silicon Valley Bank and Comerica Bank as Lenders, which is secured primarily by the assets of our operating subsidiaries in the United States and United Kingdom. On August 8, 2016, we entered into an amendment to the credit agreement, which extended its maturity date to April 26, 2018. As amended, the credit facility consists of a revolving credit facility ("Bank Line of Credit") of $55,000 with a sub-facility for letters of credit in the aggregate availability amount of $10,000 and a swingline sub-facility in the aggregate availability amount of $5,000. In addition, the agreement was amended to permit us to make certain cash distributions for interest and other payments due under the Notes, distribute up to $4,000 in aggregate for interest payments on the Notes and up to $1,500 in aggregate for cash payments in connection with any conversions of the Notes. We were in compliance with all the financial and other covenants of the credit facility at September 30, 2016.

On August 31, 2016, we used a portion of the proceeds from the Notes offering to prepay all $19,500 aggregate principal amounts outstanding under the bank line of credit.

For the three and nine months ended September 30, 2016, we recorded interest expense of $143 and $263, respectively. and amounts of $51 and $143, respectively, related to the amortization of loan issuance fees. Our average interest rate on borrowings under the bank line of credit was 4.25%.

As of September 30, 2016, we had $46,558 of unused borrowing capacity under the revolving credit facility which is net of an issued but undrawn letter of credit for $6,000 representing a security deposit on the corporate headquarters and operations facilities lease.

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STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

As of September 30, 2016, there was a total of 2,004,755 shares of common stock available for future grants under our stock purchase and equity award or incentive plans. The following table summarizes the stock-based compensation expense by financial statement line item, employees and non-employees and type of award:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Cost of revenue	$	44	$	200	$	124	$	517
Research and development	85		374		396		673
Sales and marketing	341		1,672		1,283		3,143
General and administrative	1,057		2,709		3,578		4,530
Total	$	1,527	$	4,955	$	5,381	$	8,863
Employees	$	1,519	$	4,907	$	5,367	$	8,638
Non-employees	8		48		14		225
Total	$	1,527	$	4,955	$	5,381	$	8,863

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Stock options	$	819	$	3,279	$	2,135	$	4,388
Restricted stock	346		—		692		—
Restricted stock units ("RSUs")	262		1,590		2,261		4,259
Employee Stock Purchase Plan	100		86		293		216
Total	$	1,527	$	4,955	$	5,381	$	8,863

The following table summarizes stock option plans activity:

	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (1)
Outstanding at December 31, 2015	3,682,019		$	11.51	5.98	$	31,586
Granted	466,566		14.42
Exercised	(367,328	)	6.27
Expired	(5,771	)	5.73
Forfeited	(33,707	)	10.54
Outstanding at September 30, 2016(2)	3,741,779		$	12.40	6.27	$	22,150
Vested or expected to vest:
At September 30, 2016(2)(3)	3,461,891		$	12.57	6.36	$	19,995
Vested:
At September 30, 2016	1,743,949		$	11.73	5.76	$	11,205

(1) Calculated using the estimated per-share fair market value of our common stock on September 30, 2016 and December 31, 2015, which was $17.78, and $19.74, respectively.

(2) The total includes 993,740 performance-based options at September 30, 2016.

(3) Outstanding options, net of expected forfeitures.

A summary of RSU and restricted stock activity during the nine months ended September 30, 2016 is as follows:

	RSUs		Shares of Restricted Stock
Outstanding at December 31, 2015	414,001		79,940
Granted	15,101		165,217
Vested (1) (2)	(351,029	)	(26,652	)
Outstanding at September 30, 2016	78,073		218,505

(1) Represents RSUs vested in 2016. These were net settled, which resulted in our withholding of 52,638 RSUs in lieu of withholding taxes during the nine months ended September 30, 2016, and are included in this total.

(2) Represents shares of restricted stock vested in 2016. 8,611 shares were returned to us in lieu of withholding taxes during the nine months ended September 30, 2016 and are reflected as Treasury Stock.

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Intellectual Property

In the normal course of business, we enter into agreements to obtain the rights to certain intellectual property. These agreements may require an up-front payment, milestone payments and/or royalties. Typically, we have certain rights to cancel these agreements, with notice, without additional payments due other than the amount due at the time of cancellation. As of September 30, 2016, the aggregate amount of these future payments, assuming achievement of applicable milestones and non-cancellation, was $1,418 over a period not less than five years. Royalties ranging from 2% to 10% of net sales may be due on the sales of related products. Some of the agreements contain minimum annual royalty amounts.

In November 2011, we entered into an agreement to purchase certain proprietary technology which could require us to make additional aggregate payments of up to $13,350 should certain milestones be met, including milestones related to regulatory applications and approvals. Cumulative payments under this agreement totaled $1,350 through September 30, 2016. In addition, milestone payments of $500, $2,000 and $4,000 are due upon the achievement of net sales of related products of $10,000, $25,000 and $50,000, respectively. A royalty payment of 7% of net sales of related products may be due until such sales reaches $20,000.

The medical device industry is characterized by frequent claims and litigation, including claims regarding patent and other

intellectual property rights as well as improper hiring practices. We are not aware of any pending or threatened legal proceeding against us that would have a material adverse effect on our business, operating results or financial condition. However, we are a party in multiple legal actions involving claimants seeking various remedies, including monetary damages, and none of the outcomes are certain or entirely within our control.

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INCOME TAXES

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The provision for income taxes for the three and nine months ended September 30,2016 and 2015 includes both domestic and foreign minimum income taxes and changes in the valuation allowance. For the three months ended September 30,2016 and 2015, the income tax (benefit) expense was $(53) and $83, resulting in an effective tax rate of 0.7% and (0.8)%, respectively. For the nine months ended September 30, 2016 and 2015, income tax expense was $21 and $125, resulting in an effective tax rate of (0.1)% and (0.4)%, respectively. The effective tax rate differs from the statutory rate due to minimum income taxes, permanent differences and changes in valuation allowances.

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NET LOSS PER SHARE

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

NET LOSS PER SHARE

NET LOSS PER SHARE

The following table sets forth the computation of basic and diluted loss per share:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net loss per common share:
Net loss	$	(7,910	)	$	(10,215	)	$	(29,193	)	$	(30,722	)
Basic and diluted loss per common share:
Basic and diluted weighted average common shares      outstanding	41,940,370			41,074,245			41,639,609			39,892,068
Basic and diluted loss per common share	$	(0.19	)	$	(0.25	)	$	(0.70	)	$	(0.77	)

The following outstanding Company securities, using the treasury stock method, were excluded from the above computations of net loss per share because their impact would be antidilutive due to the net losses during the three months ended September 30,2016 and 2015:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2016	2015	2016	2015
Stock options	3,741,779	3,750,830	3,741,779	3,750,830
RSUs	78,073	414,001	78,073	414,001
Restricted stock	218,505	79,940	218,505	79,940

As discussed in Note 9, in August 2016, we issued $50,000 aggregate principal amount of Notes. The Notes may be settled, at our election, in cash, shares of our common stock or combination of cash and shares of our common stock. For purposes of calculating the maximum dilutive impact, it is presumed that the Notes will be settled in common stock with the resulting potential common shares included in diluted earnings per share if the effect is more dilutive. The effect of the conversion of Notes is excluded from the calculation of diluted loss per share because the net loss for the three and nine months ended September 30, 2016 causes such securities to be antidilutive.

The potential dilutive effect of these securities is shown in the table below:

	Three Months Ended	Nine Months Ended
	September 30, 2016	September 30, 2016
Conversion of Notes	2,917,165	2,917,165

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SEGMENT AND GEOGRAPHICAL CONCENTRATION

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

SEGMENT AND GEOGRAPHICAL CONCENTRATION

SEGMENT AND GEOGRAPHICAL CONCENTRATION

Operating segments are defined as components of an enterprise for which separate discrete financial information is available and evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. We manage the business globally within one reporting segment. Segment information is consistent with how management reviews the business, makes investing and resource allocation decisions and assesses operating performance. Products are sold principally in the United States. International revenue represented 22.5% and 23.7% of total revenue for the three and nine months ended September 30, 2016; however, revenue earned in any individual foreign country is below 10% of our consolidated revenue.

The following table represents total revenue by geographic area, based on the location of the customer:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
United States	$	45,978	$	39,459	$	133,409	$	116,055
International	13,332		15,550		41,434		45,732
Total	$	59,310	$	55,009	$	174,843	$	161,787

We classify sales within the United States into three categories: complex spine pathologies, minimally invasive procedures and degenerative and other conditions. A significant portion of our international revenue is derived from our distributor partners who do not report their product usage at the surgeon or hospital level, which prevents us from providing a specific breakdown for our international revenue among its three product categories. These sales transactions are settled when we ship the product to the agent.

In the fourth quarter of 2015, we refined our reporting of procedure revenue that included the sale of certain single-use MIS products which are sold in support of degenerative surgical procedures as degenerative revenue.  Historically these sales were reflected in the MIS product category.  As a result of this reclassification, our historically reported MIS revenue has decreased and our degenerative revenue has increased $1,057 and $2,358 for the three and nine months ended September 30, 2015 to conform to the current year presentation.

The following table represents domestic revenue by current procedure category:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Complex spine	$	19,516	$	16,852	$	53,981	$	48,204
Minimally invasive	6,767		6,344		20,653		17,766
Degenerative	19,695		16,263		58,775		50,085
	45,978		39,459		133,409		116,055
International	13,332		15,550		41,434		45,732
Total	$	59,310	$	55,009	$	174,843	$	161,787

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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Policies)

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and all of its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States or US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates

Net Loss per Share

Net Loss per Share

Basic net loss per common share is determined by dividing the net loss allocable to common stockholders by the weighted average number of common shares outstanding during the periods presented, without consideration of common stock equivalents. Diluted loss per share is computed by dividing the net loss allocable to common stockholders by the weighted average number of shares of common stock and common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of our stock option grants and the if-converted method is used to determine the dilutive effect of the convertible senior notes. The weighted average shares used to calculate both basic and diluted loss per share are the same because common stock equivalents were excluded in the calculation of diluted loss per share because their effect would be anti-dilutive. Although included in our outstanding shares total as of September 30, 2016, shares of restricted stock contingently issuable until their restrictions lapse and have been excluded from the weighted average shares outstanding.

Foreign Currency Translation and Other Comprehensive Loss

Foreign Currency Translation and Other Comprehensive Loss

Our results of operations and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. Our reporting currency is the U.S. dollar, which is also the functional currency of our domestic entities, while the functional currency of our foreign subsidiaries are the British Pound, Euro and Swiss Franc. Assets and liabilities denominated in foreign currencies are translated at the rate of exchange on the balance sheet date. Revenues and expenses are translated using the average exchange rate for the period. Net gains and losses resulting from the translation of foreign financial statements are recorded in other comprehensive income (loss). Net foreign currency gains or losses resulting from transactions in currencies other than the functional currencies are included in other expense, net on the consolidated statements of operations.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

We qualify as an “emerging growth company” (EGC) pursuant to the provisions of the JOBS Act and elected to take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act which permits EGCs to defer compliance with new or revised accounting standards (the EGC extension) until non-issuers are required to comply with such standards. Accordingly, so long as we continue to qualify as an EGC, we will not have to adopt or comply with new or revised accounting standards until non-issuers are required to comply with such standards.

In March 2016, the Financial Accounting Standards Board, or FASB issued ASU 2016-06, Contingent Put and Call Options in Debt Instruments (Topic 815), which addressesthe accounting for embedded derivatives related to debt contracts. The update clarifies that determining whether the economic characteristics of a put or call are clearly and closely related to its debt host requires only an assessment of the four-step decision sequence. It also indicates that entities are not required to separately assess whether the contingency itself is clearly and closely related. For public entities the guidance will be effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. The guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of the initial application. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance. We are currently assessing the impact of this guidance.

In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which addresses principal versus agent considerations, reporting revenue gross versus net in the new revenue recognition standard. The guidance clarifies how an entity should evaluate the unit of accounting to determine whether it is a specified good or service and how it should apply the control principle to certain types of arrangements. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. The guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of the initial application. We are currently assessing the impact of this guidance.

In March 2016, the FASB issued ASU No. 2016-09, Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which is intended to improve employee share-based payment accounting for companies that issue share-based awards to their employees. This guidance simplifies the accounting for share-based payment transactions, including consequences of income tax award, classification as either equity or liability, treatment of forfeitures, and classification on statement of cash flows. The recognition, measurement and reporting for share-based payments will be affected by this new guidance. For public entities other than EGCs that have elected the EGC extension, the guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance, but all of the guidance must be adopted in the same period. We are currently evaluating the impact of this guidance.

In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which includesfinal amendments to clarify the guidance on identifying performance obligations and accounting for licenses of intellectual property ("IP") in its new revenue recognition standard. The amendment allows entities to disregard goods or services that are immaterial in the context of a contract, assess whether the performance obligation is separately identifiable and whether the shipping and handling activities are a promised service in a contract. This guidance also clarifies how an entity should evaluate the nature of its promise in granting an IP license and when a promised good or service is distinct within the context of a contract. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. We are currently assessing the impact of this guidance.

In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, which clarifies that for a contract to be considered completed the entity should evaluate the collectability threshold or probability of collecting revenue. It provides that the fair value of noncash consideration such as equity should be measured at contract inception when determining the transaction price and any subsequent changes must be recorded as a gain or loss, not as revenue. The entity has the option to make an accounting policy election to exclude from the transaction price certain types of taxes such as sales tax, value-added tax and excise tax in lieu of evaluating such taxes they collect in all jurisdictions to determine whether a tax is levied to the entity or the customer. The guidance will be effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for reporting periods beginning after December 15, 2016. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for annual reporting periods beginning after December 15, 2018. We are currently assessing the impact of this guidance.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This guidance eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees, and beneficial interests obtained in a financial asset securitization. It also provides clarifications related to separately identifiable cash-flows and application of the predominance principle based on evaluating the source and nature of the underlying cash flows when determining whether it is a financing, investing, operating or a combination of cash flow classifications. For public entities the guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. All other entities, such as EGCs that have elected the EGC extension, including us, and non-public entities will be required to comply with the guidance for fiscal years beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. Early adoption is permitted in any annual or interim period for which financial statements have not been issued or made available for issuance, but all of the guidance must be adopted in the same period. We are currently assessing the impact of this guidance.

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ACCOUNTS RECEIVABLE - (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

The following table summarizes the accounts receivables, net of allowances:

	September 30, 2016			December 31, 2015
Accounts receivable	$	45,395		$	41,210
Allowances	(2,180		)	(2,437		)
Accounts receivable, net	$	43,215		$	38,773

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INVENTORY - (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Schedule of Current Inventory

The following table summarizes the inventory, net of allowances:

	September 30, 2016			December 31, 2015
Finished goods	$	99,478		$	90,226
Inventory allowances	(32,741		)	(28,224		)
Inventory, net	$	66,737		$	62,002

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PREPAID AND OTHER CURRENT ASSETS (Tables)

9 Months Ended

Sep. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of prepaid expenses and other current assets

The following table summarizes prepaid expenses and other current assets:

	September 30, 2016		December 31, 2015
Restricted cash	$	517	$	6,669
Landlord incentives for leasehold improvements	—		6,454
Prepaid expenses	2,522		2,408
Other	3,404		4,289
Total	$	6,443	$	19,820

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PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

The following table summarizes property, plant and equipment:

	Estimated Useful Lives	September 30, 2016			December 31, 2015
Buildings under capital lease	16 years	$	26,469		$	26,469
Leasehold improvements, including property under capital lease	15 years	19,317			9,717
Equipment	3-5 years	3,754			3,054
Software	3 years	4,644			4,231
Computer equipment	3 years	1,050			1,493
Furniture and office equipment	5-7 years	3,678			1,050
Vehicles and other	3 years	749			795
Total		59,661			46,809
Less accumulated depreciation and amortization		(8,640		)	(8,491		)
Property, plant and equipment, net		$	51,021		$	38,318

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INTANGIBLE ASSETS - (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

6.    INTANGIBLE ASSETS

Intangible assets, net comprise the following:

	September 30, 2016
	Estimated Useful Lives	Gross		Accumulated Amortization			Net
Indefinite-lived intangible assets:
Trademarks	—	$	12,900	$	—		$	12,900
In-process research and development	—	900		—			900
Other	—	233		—			233
Subtotal		14,033		—			14,033
Subject to amortization
Developed technology	4 - 6 years	62,000		(56,581		)	5,419
Licensed technology	4 - 6 years	52,600		(52,437		)	163
Customer relationships	4 - 7 years	29,700		(25,988		)	3,712
Patents and other	2 - 17 years	3,277		(1,264		)	2,013
Subtotal		147,577		(136,270		)	11,307
Intangible assets, net		$	161,610	$	(136,270	)	$	25,340

	December 31, 2015
	Estimated Useful Lives	Gross		Accumulated Amortization			Net
Indefinite-lived intangible assets:
Trademarks	—	$	12,900	$	—		$	12,900
In-process research and development	—	900		—			900
Other	—	266		—			266
Subtotal		14,066		—			14,066
Subject to amortization
Developed technology	4 - 6 years	62,000		(52,243		)	9,757
Licensed technology	4 - 6 years	52,600		(52,325		)	275
Customer relationships	4 - 7 years	29,700		(22,805		)	6,895
Patents and other	2 - 17 years	3,245		(1,115		)	2,130
Subtotal		147,545		(128,488		)	19,057
Intangible assets, net		$	161,611	$	(128,488	)	$	33,123

Schedule of Expected Amortization Expense

As of September 30, 2016, the expected amortization expense for the remainder of 2016 and the following four years and thereafter is as follows:

	September 30, 2016
2016	$	2,594
2017	6,763
2018	267
2019	257
2020	232
Thereafter	1,194
Total	$	11,307

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OTHER ASSETS - (Tables)

9 Months Ended

Sep. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Other Assets

Other assets consist of the following:

	September 30, 2016		December 31, 2015
Surgical instruments, net	$	26,936	$	23,945
Restricted cash	2,411		1,298
Other	1,232		773
Total	$	30,579	$	26,016

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ACCRUED EXPENSES - (Tables)

9 Months Ended

Sep. 30, 2016

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:

	September 30, 2016		December 31, 2015
Accrued commissions	$	5,834	$	5,336
Accrued royalties	3,081		2,704
Other	4,874		5,519
Total	$	13,789	$	13,559

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STOCK-BASED COMPENSATION - (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock-based compensation expense

The following table summarizes the stock-based compensation expense by financial statement line item, employees and non-employees and type of award:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Cost of revenue	$	44	$	200	$	124	$	517
Research and development	85		374		396		673
Sales and marketing	341		1,672		1,283		3,143
General and administrative	1,057		2,709		3,578		4,530
Total	$	1,527	$	4,955	$	5,381	$	8,863
Employees	$	1,519	$	4,907	$	5,367	$	8,638
Non-employees	8		48		14		225
Total	$	1,527	$	4,955	$	5,381	$	8,863

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Stock options	$	819	$	3,279	$	2,135	$	4,388
Restricted stock	346		—		692		—
Restricted stock units ("RSUs")	262		1,590		2,261		4,259
Employee Stock Purchase Plan	100		86		293		216
Total	$	1,527	$	4,955	$	5,381	$	8,863

Schedule of employee stock option plan activity

The following table summarizes stock option plans activity:

	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (1)
Outstanding at December 31, 2015	3,682,019		$	11.51	5.98	$	31,586
Granted	466,566		14.42
Exercised	(367,328	)	6.27
Expired	(5,771	)	5.73
Forfeited	(33,707	)	10.54
Outstanding at September 30, 2016(2)	3,741,779		$	12.40	6.27	$	22,150
Vested or expected to vest:
At September 30, 2016(2)(3)	3,461,891		$	12.57	6.36	$	19,995
Vested:
At September 30, 2016	1,743,949		$	11.73	5.76	$	11,205

(1) Calculated using the estimated per-share fair market value of our common stock on September 30, 2016 and December 31, 2015, which was $17.78, and $19.74, respectively.

(2) The total includes 993,740 performance-based options at September 30, 2016.

(3) Outstanding options, net of expected forfeitures.

Schedule of restricted stock and RSU activity

A summary of RSU and restricted stock activity during the nine months ended September 30, 2016 is as follows:

	RSUs		Shares of Restricted Stock
Outstanding at December 31, 2015	414,001		79,940
Granted	15,101		165,217
Vested (1) (2)	(351,029	)	(26,652	)
Outstanding at September 30, 2016	78,073		218,505

(1) Represents RSUs vested in 2016. These were net settled, which resulted in our withholding of 52,638 RSUs in lieu of withholding taxes during the nine months ended September 30, 2016, and are included in this total.

(2) Represents shares of restricted stock vested in 2016. 8,611 shares were returned to us in lieu of withholding taxes during the nine months ended September 30, 2016 and are reflected as Treasury Stock.

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NET LOSS PER SHARE - (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted loss per share:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net loss per common share:
Net loss	$	(7,910	)	$	(10,215	)	$	(29,193	)	$	(30,722	)
Basic and diluted loss per common share:
Basic and diluted weighted average common shares      outstanding	41,940,370			41,074,245			41,639,609			39,892,068
Basic and diluted loss per common share	$	(0.19	)	$	(0.25	)	$	(0.70	)	$	(0.77	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following outstanding Company securities, using the treasury stock method, were excluded from the above computations of net loss per share because their impact would be antidilutive due to the net losses during the three months ended September 30,2016 and 2015:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2016	2015	2016	2015
Stock options	3,741,779	3,750,830	3,741,779	3,750,830
RSUs	78,073	414,001	78,073	414,001
Restricted stock	218,505	79,940	218,505	79,940

As discussed in Note 9, in August 2016, we issued $50,000 aggregate principal amount of Notes. The Notes may be settled, at our election, in cash, shares of our common stock or combination of cash and shares of our common stock. For purposes of calculating the maximum dilutive impact, it is presumed that the Notes will be settled in common stock with the resulting potential common shares included in diluted earnings per share if the effect is more dilutive. The effect of the conversion of Notes is excluded from the calculation of diluted loss per share because the net loss for the three and nine months ended September 30, 2016 causes such securities to be antidilutive.

The potential dilutive effect of these securities is shown in the table below:

	Three Months Ended	Nine Months Ended
	September 30, 2016	September 30, 2016
Conversion of Notes	2,917,165	2,917,165

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SEGMENT AND GEOGRAPHICAL CONCENTRATION - (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Schedule of Revenue by Geographic Area

The following table represents total revenue by geographic area, based on the location of the customer:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
United States	$	45,978	$	39,459	$	133,409	$	116,055
International	13,332		15,550		41,434		45,732
Total	$	59,310	$	55,009	$	174,843	$	161,787

Schedule of Revenue by Products

The following table represents domestic revenue by current procedure category:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Complex spine	$	19,516	$	16,852	$	53,981	$	48,204
Minimally invasive	6,767		6,344		20,653		17,766
Degenerative	19,695		16,263		58,775		50,085
	45,978		39,459		133,409		116,055
International	13,332		15,550		41,434		45,732
Total	$	59,310	$	55,009	$	174,843	$	161,787

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ACCOUNTS RECEIVABLE - (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Receivables [Abstract]
Accounts receivable	$ 45,395	$ 41,210
Allowances	(2,180)	(2,437)
Accounts receivable, net	$ 43,215	$ 38,773

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INVENTORY - (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory [Line Items]
Finished goods	$ 99,478	$ 90,226
Inventory allowances	(32,741)	(28,224)
Inventory, net	66,737	62,002
Surgical and Medical Instruments
Inventory [Line Items]
Inventory, net	$ 10,499	$ 8,946

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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Restricted cash	$ 517	$ 6,669
Landlord incentives for leasehold improvements	0	6,454
Prepaid expenses	2,522	2,408
Other	3,404	4,289
Total	$ 6,443	$ 19,820

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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total	$ 59,661	$ 46,809
Less accumulated depreciation and amortization	(8,640)	(8,491)
Property, plant and equipment, net	$ 51,021	38,318
Buildings under capital lease
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	16 years
Total	$ 26,469	26,469
Leasehold improvements, including property under capital lease
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	15 years
Total	$ 19,317	9,717
Equipment
Property, Plant and Equipment [Line Items]
Total	$ 3,754	3,054
Software
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Total	$ 4,644	4,231
Computer equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Total	$ 1,050	1,493
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total	$ 3,678	1,050
Vehicles and other
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Total	$ 749	$ 795
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Minimum | Furniture and office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum | Furniture and office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	7 years

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PROPERTY, PLANT AND EQUIPMENT PPE narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 1,374	$ 423	$ 3,526	$ 1,513
Capital Leases, Income Statement, Amortization Expense	416		1,247
Interest Expense, Lessee, Assets under Capital Lease	554		1,700
Total	59,661		59,661		$ 46,809
Construction in Progress
Property, Plant and Equipment [Line Items]
Leasehold Improvements, Gross	18,745		18,745		8,242
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total	3,678		3,678		$ 1,050
Corporate Headquarters and Other Operational Facilities | Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total	$ 4,059		$ 4,059

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INTANGIBLE ASSETS - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Intangible Asset by Major Class [Line Items]
Indefinite-lived intangible assets	$ 14,033		$ 14,033		$ 14,066
Subject to amortization, Gross	147,577		147,577		147,545
Accumulated Amortization	(136,270)		(136,270)		(128,488)
Total	11,307		11,307		19,057
Intangible Assets, Gross	161,610		161,610		161,611
Intangible Assets, Net	25,340		25,340		33,123
Amortization expense	2,594	$ 2,560	7,781	$ 7,733
Developed technology
Schedule of Intangible Asset by Major Class [Line Items]
Subject to amortization, Gross	62,000		62,000		62,000
Accumulated Amortization	(56,581)		(56,581)		(52,243)
Total	5,419		5,419		9,757
Licensed technology
Schedule of Intangible Asset by Major Class [Line Items]
Subject to amortization, Gross	52,600		52,600		52,600
Accumulated Amortization	(52,437)		(52,437)		(52,325)
Total	163		163		275
Customer relationships
Schedule of Intangible Asset by Major Class [Line Items]
Subject to amortization, Gross	29,700		29,700		29,700
Accumulated Amortization	(25,988)		(25,988)		(22,805)
Total	3,712		3,712		6,895
Patents and other
Schedule of Intangible Asset by Major Class [Line Items]
Subject to amortization, Gross	3,277		3,277		3,245
Accumulated Amortization	(1,264)		(1,264)		(1,115)
Total	2,013		2,013		2,130
Trademarks
Schedule of Intangible Asset by Major Class [Line Items]
Indefinite-lived intangible assets	12,900		12,900		12,900
In-process research and development
Schedule of Intangible Asset by Major Class [Line Items]
Indefinite-lived intangible assets	900		900		900
Other
Schedule of Intangible Asset by Major Class [Line Items]
Indefinite-lived intangible assets	$ 233		$ 233		$ 266
Minimum | Developed technology
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			4 years		4 years
Minimum | Licensed technology
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			4 years		4 years
Minimum | Customer relationships
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			4 years		4 years
Minimum | Patents and other
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			2 years		2 years
Maximum | Developed technology
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			6 years		6 years
Maximum | Licensed technology
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			6 years		6 years
Maximum | Customer relationships
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			7 years		7 years
Maximum | Patents and other
Schedule of Intangible Asset by Major Class [Line Items]
Estimated Useful Lives			17 years		17 years

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INTANGIBLE ASSETS Schedule of Expected Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2016	$ 2,594
2017	6,763
2018	267
2019	257
2020	232
Thereafter	1,194
Total	$ 11,307	$ 19,057

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OTHER ASSETS - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Surgical instruments, net	$ 26,936		$ 26,936		$ 23,945
Restricted cash	2,411		2,411		1,298
Other	1,232		1,232		773
Total	30,579		30,579		26,016
Surgical instruments accumulated amortization	31,603		31,603		$ 26,609
Amortization expense	$ 2,517	$ 2,304	$ 7,431	$ 6,688

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ACCRUED EXPENSES - (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued commissions	$ 5,834	$ 5,336
Accrued royalties	3,081	2,704
Other	4,874	5,519
Total	$ 13,789	$ 13,559

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DEBT (Details)		3 Months Ended		9 Months Ended
	Aug. 11, 2016 USD ($)	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) trading_day $ / shares	Sep. 30, 2015 USD ($)	Aug. 31, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs				$ 47,575,000	$ 0
Deferred convertible senior notes issuance costs				486,000	0
Repayments of Lines of Credit				19,500,000	25,000,000
Interest Expense		$ 1,319,000	$ 110,000	2,705,000	$ 354,000
Letter of credit		$ 6,000,000		6,000,000
Convertible Senior Notes Due 2036
Debt Instrument [Line Items]
Principal amounts of debt	$ 50,000,000					$ 50,000,000
Interest rate (as a percent)	4.125%
Proceeds from issuance of convertible senior notes, net of issuance costs				47,091,000
Deferred convertible senior notes issuance costs				$ 2,909,000
Convertible debt, threshold trading days | trading_day				20
Convertible debt, threshold consecutive trading days				30 days
Convertible debt, threshold percentage of stock price trigger				130.00%
Convertible debt, measurement period (in trading days)				5 days
Convertible debt, maximum percentage of trading price per $1,000 principal amount trigger				98.00%
Convertible debt, conversion ratio				0.0457603
Convertible debt, conversion price (in usd per share) | $ / shares		$ 21.85		$ 21.85
Fair value of long term debt	$ 38,334,000	$ 36,352,000		$ 36,352,000
Fair value of embedded conversion option	$ 11,666,000
Interest expense		558,000		558,000
Interest expense to be paid in cash		281,000		281,000
Interest expense, non cash accretion of debt discount		277,000		277,000
Long-term debt		$ 38,648,000		$ 38,648,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, average interest rate (as a percent)		4.25%		4.25%
Unused borrowing capacity		$ 46,558,000		$ 46,558,000
Revolving Credit Facility | October 2015 Amendment
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		55,000,000		55,000,000
Revolving Credit Facility | Credit Agreement 2012
Debt Instrument [Line Items]
Interest Expense		143,000		263,000
Revolving Credit Facility | Line of Credit | Amended Credit Agreement 2012
Debt Instrument [Line Items]
Maximum amount of distributions for interest payments						4,000,000
Maximum amount of distributions for cash payments						$ 1,500,000
Revolving Credit Facility | Line of Credit | Credit Agreement 2012
Debt Instrument [Line Items]
Amortization of Financing Costs		51,000		143,000
Letter of Credit | Line of Credit | Amended Credit Agreement 2012
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		10,000,000		10,000,000
Revolving Credit Facility, Swing Line Loan | Line of Credit | Amended Credit Agreement 2012
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 5,000,000		5,000,000
Accounting Standards Update 2015-03 | Long-term Debt | Convertible Senior Notes Due 2036
Debt Instrument [Line Items]
Deferred convertible senior notes issuance costs				(2,228,000)
Accounting Standards Update 2015-03 | Additional Paid-in Capital | Convertible Senior Notes Due 2036
Debt Instrument [Line Items]
Deferred convertible senior notes issuance costs				$ (681,000)

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STOCK-BASED COMPENSATION - Narrative (Details)	Sep. 30, 2016 shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,004,755

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STOCK-BASED COMPENSATION - Allocation of Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	$ 1,527	$ 4,955	$ 5,381	$ 8,863
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	44	200	124	517
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	85	374	396	673
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	341	1,672	1,283	3,143
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	1,057	2,709	3,578	4,530
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	1,519	4,907	5,367	8,638
Non-employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	8	48	14	225
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	819	3,279	2,135	4,388
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	346	0	692	0
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	262	1,590	2,261	4,259
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	$ 100	$ 86	$ 293	$ 216

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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2016		Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Beginning Balance, Shares		3,682,019
Granted, Shares		466,566
Exercised, Shares		(367,328)
Expired, Shares		(5,771)
Forfeited, Shares		(33,707)
Outstanding Ending Balance, Shares		3,741,779	[1]	3,682,019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning, Weighted-Average Exercise Price (in usd per share)		$ 11.51
Granted, Weighted-Average Exercise Price (in usd per share)		14.42
Exercised, Weighted-Average Exercise Price (in usd per share)		6.27
Expired, Weighted-Average Exercise Price (in usd per share)		5.73
Forfeited, Weighted-Average Exercise Price (in usd per share)		10.54
Ending, Weighted-Average Exercise Price (in usd per share)		$ 12.40		$ 11.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, Weighted- Average Remaining Contractual Term (years)		6 years 3 months 7 days		5 years 11 months 23 days
Outstanding, Aggregate Intrinsic Value	[2]	$ 31,586
Outstanding, Aggregate Intrinsic Value	[2]	$ 22,150		$ 31,586
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Vested or expected to vest, shares	[1],[3]	3,461,891
Vested or expected to vest, Weighted-Average Exercise Price (in usd per share)		$ 12.57
Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		6 years 4 months 9 days
Vested or expected to vest, Aggregate Intrinsic Value	[2]	$ 19,995
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested [Abstract]
Vested, shares		1,743,949
Vested, Weighted-Average Exercise Price (in usd per share)		$ 11.73
Vested, Weighted-Average Remaining Contractual Term		5 years 9 months 3 days
Vested, Aggregate Intrinsic Value	[2]	$ 11,205
Fair value valuation, estimated fair market value of stock (in dollars per share)		$ 17.78		$ 19.74
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Ending Balance, Shares		993,740

[1] The total includes 993,740 performance-based options at September 30, 2016.

[2] Calculated using the estimated per-share fair market value of our common stock on September 30, 2016 and December 31, 2015, which was $17.78, and $19.74, respectively.

[3] Outstanding options, net of expected forfeitures.

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STOCK-BASED COMPENSATION RSU and restricted stock table (Details)	9 Months Ended
	Sep. 30, 2016 shares
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Beginning Balance, Shares	414,001
Granted (in shares)	15,101
Vested (in shares)	(351,029)	[1]
Outstanding Ending Balance, Shares	78,073
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	52,638
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Beginning Balance, Shares	79,940
Granted (in shares)	165,217
Vested (in shares)	(26,652)	[2]
Outstanding Ending Balance, Shares	218,505
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	8,611

[1] Represents RSUs vested in 2016. These were net settled, which resulted in our withholding of 52,638 RSUs in lieu of withholding taxes during the nine months ended September 30, 2016, and are included in this total.

[2] Represents shares of restricted stock vested in 2016. 8,611 shares were returned to us in lieu of withholding taxes during the nine months ended September 30, 2016 and are reflected as Treasury Stock.

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COMMITMENTS AND CONTINGENCIES - (Details) - USD ($)	1 Months Ended	9 Months Ended
	Nov. 30, 2011	Sep. 30, 2016	Sep. 30, 2015
Long-term Purchase Commitment [Line Items]
Initial payment to acquire proprietary technology		$ 1,282,000	$ 538,000
Licensed technology
Long-term Purchase Commitment [Line Items]
Other Commitment		$ 1,418,000
Minimum contractual term		5 years
Licensed technology | Minimum
Long-term Purchase Commitment [Line Items]
Future maximum royalty payments		2.00%
Licensed technology | Maximum
Long-term Purchase Commitment [Line Items]
Future maximum royalty payments		10.00%
Patents and other
Long-term Purchase Commitment [Line Items]
Future maximum royalty payments	7.00%
Initial payment to acquire proprietary technology		$ 1,350,000
Milestone payment one	$ 500,000
Milestone payment two	2,000,000
Milestone payment three	4,000,000
Milestone for milestone payment one	10,000,000
Milestone for milestone payment two	25,000,000
Milestone for milestone payment three	50,000,000
Milestone for ending royalty payments, cumulative sales	20,000,000
Patents and other | Maximum
Long-term Purchase Commitment [Line Items]
Other Commitment	$ 13,350,000

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INCOME TAXES - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (53)	$ 83	$ 21	$ 125
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.70%	(0.80%)	(0.10%)	(0.40%)

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NET LOSS PER SHARE - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net loss	$ (7,910)	$ (10,215)	$ (29,193)	$ (30,722)
Basic and diluted weighted average common shares outstanding	41,940,370	41,074,245	41,639,609	39,892,068
Basic and diluted loss per common share (in dollars per share)	$ (0.19)	$ (0.25)	$ (0.70)	$ (0.77)

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NET LOSS PER SHARE - Antidilutive Shares (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Aug. 31, 2016	Aug. 11, 2016
Convertible Senior Notes Due 2036
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Earnings Per Share (in shares)	2,917,165		2,917,165
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Earnings Per Share (in shares)	3,741,779	3,750,830	3,741,779	3,750,830
Restricted stock units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Earnings Per Share (in shares)	78,073	414,001	78,073	414,001
Restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Earnings Per Share (in shares)	218,505	79,940	218,505	79,940
Convertible Senior Notes Due 2036
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Principal amounts of debt					$ 50,000,000	$ 50,000,000

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SEGMENT AND GEOGRAPHICAL CONCENTRATION - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			1
Revenue	$ 59,310	$ 55,009	$ 174,843	$ 161,787
United States
Segment Reporting Information [Line Items]
Revenue	45,978	39,459	133,409	116,055
Sales Revenue, Net
Segment Reporting Information [Line Items]
Revenue	59,310	55,009	174,843	161,787
Sales Revenue, Net | International
Segment Reporting Information [Line Items]
Revenue	13,332	15,550	41,434	45,732
Sales Revenue, Net | United States
Segment Reporting Information [Line Items]
Revenue	$ 45,978	39,459	$ 133,409	116,055
Sales Revenue, Net | Geographic Concentration Risk | International
Segment Reporting Information [Line Items]
International revenue as a percentage of total revenue	22.50%		23.70%
Sales Revenue, Net | Geographic Concentration Risk | United States
Segment Reporting Information [Line Items]
International revenue as a percentage of total revenue	10.00%		10.00%
Minimally invasive | United States
Segment Reporting Information [Line Items]
Revenue	$ 6,767	6,344	$ 20,653	17,766
Minimally invasive | Scenario, Adjustment
Segment Reporting Information [Line Items]
Revenue		$ (1,057)		$ (2,358)

XML

SEGMENT AND GEOGRAPHICAL CONCENTRATION - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 59,310	$ 55,009	$ 174,843	$ 161,787
Sales Revenue, Net
Segment Reporting Information [Line Items]
Revenue	59,310	55,009	174,843	161,787
United States
Segment Reporting Information [Line Items]
Revenue	45,978	39,459	133,409	116,055
United States | Sales Revenue, Net
Segment Reporting Information [Line Items]
Revenue	45,978	39,459	133,409	116,055
International | Sales Revenue, Net
Segment Reporting Information [Line Items]
Revenue	$ 13,332	$ 15,550	$ 41,434	$ 45,732

XML

SEGMENT AND GEOGRAPHICAL CONCENTRATION - Revenues by Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue from External Customer [Line Items]
Revenue	$ 59,310	$ 55,009	$ 174,843	$ 161,787
United States
Revenue from External Customer [Line Items]
Revenue	45,978	39,459	133,409	116,055
United States | Complex spine
Revenue from External Customer [Line Items]
Revenue	19,516	16,852	53,981	48,204
United States | Minimally invasive
Revenue from External Customer [Line Items]
Revenue	6,767	6,344	20,653	17,766
United States | Degenerative
Revenue from External Customer [Line Items]
Revenue	19,695	16,263	58,775	50,085
International
Revenue from External Customer [Line Items]
Revenue	$ 13,332	$ 15,550	$ 41,434	$ 45,732