Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (51,879)	$ (129,752)
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	(97)	383
Depreciation and amortization	6,933	6,566
Stock-based compensation	8,800	9,641
Change in fair value of derivative liabilities	0	43,831
Change in fair value of contingent consideration related to acquisition	(3,400)	100
Accretion of interest & amortization of deferred financing costs on debt	7,558	7,037
Non-cash foreign exchange (gain) loss	(560)	838
Non-cash loss on debt extinguishment	3,997	0
Changes in operating assets and liabilities:
Restricted cash	(368)	(2,001)
Accounts receivable and other receivables	2,859	(3,883)
Inventories	(1,048)	2,083
Prepaid expenses and other current assets	(237)	535
Accounts payable	(3,447)	(6,607)
Accrued payroll	(3,225)	7,660
Accrued expenses and other liabilities	(2,509)	3,498
Net cash used in operating activities	(36,623)	(60,071)
Cash flows from investing activities:
Purchases of marketable securities	0	(20,976)
Maturities of marketable securities	21,000	37,850
Purchases of property and equipment	(876)	(2,051)
Acquisition of business, net of cash acquired of $0 and $24,012, respectively	0	(60,622)
Net cash provided by (used in) investing activities	20,124	(45,799)
Cash flows from financing activities:
Net proceeds from revolving line of credit	15,441	0
Deferred financing costs	(6,755)	(917)
Proceeds from sale of common stock under employee stock purchase plan	1,681	2,520
Proceeds from exercise of stock options	482	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	64,236	3,246
Effect of exchange rate changes on cash and cash equivalents	762	93
Net increase (decrease) in cash and cash equivalents	48,499	(102,531)
Cash and cash equivalents, beginning of period	26,120	124,553
Cash and cash equivalents, end of period	74,619	22,022
Supplemental disclosure of cash flow information:
Cash paid for interest	7,447	3,088
Cash paid for income taxes	672	214
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	176	64
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