Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (37,606)	$ (114,507)
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	(89)	0
Depreciation and amortization	4,645	4,229
Stock-based compensation	6,188	6,768
Change in fair value of derivative liabilities	0	43,831
Change in fair value of contingent consideration related to acquisition	(2,600)	100
Accretion of interest & amortization of deferred financing costs on debt	5,004	4,603
Non-cash foreign exchange loss (gain)	(206)	810
Non-cash loss on debt extinguishment	3,997	0
Changes in operating assets and liabilities:
Restricted cash	(876)	0
Accounts receivable and other receivables	3,470	(2,445)
Inventories	(2,174)	3,557
Prepaid expenses and other current assets	(762)	1,100
Accounts payable	(3,486)	(5,812)
Accrued payroll	(3,220)	6,922
Accrued expenses and other liabilities	(1,092)	1,889
Net cash used in operating activities	(28,807)	(48,955)
Cash flows from investing activities:
Purchases of marketable securities	0	(5,017)
Maturities of marketable securities	11,000	19,350
Purchases of property and equipment	(833)	(1,304)
Acquisition of business, net of cash acquired of $0 and $24,012, respectively	0	(60,622)
Net cash (used in) provided by investing activities	10,167	(47,593)
Cash flows from financing activities:
Net proceeds from revolving line of credit	24,297	0
Deferred financing costs	(6,285)	0
Proceeds from sale of common stock under employee stock purchase plan	1,681	1,826
Proceeds from exercise of stock options	449	1,777
Proceeds from issuance of debt	120,000	0
Repayment of debt	(66,613)	0
Minimum tax withholding paid on behalf of employees for restricted stock units	0	(134)
Net cash provided by financing activities	73,529	3,469
Effect of exchange rate changes on cash and cash equivalents	632	(26)
Net (decrease) in cash and cash equivalents	55,521	(93,105)
Cash and cash equivalents, beginning of period	26,120	124,553
Cash and cash equivalents, end of period	81,641	31,448
Supplemental disclosure of cash flow information:
Cash paid for interest	2,956	2,994
Cash paid for income taxes	565	167
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	26	0
Fair value of common stock issued for business acquisition	0	100,812
Fair value of warrants issued for business acquisition	0	44
Fair value of warrants issued in connection with the Facility Agreement	$ 14,704	$ 0