Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (21,314)	$ (47,671)
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	23	0
Depreciation and amortization	2,313	2,232
Stock-based compensation	2,954	2,882
Change in fair value of derivative liabilities	0	5,088
Change in fair value of contingent consideration related to acquisition	1,200	0
Accretion of interest & amortization of deferred financing costs on convertible notes	2,547	2,279
Non-cash foreign exchange loss	4	270
Changes in operating assets and liabilities:
Accounts receivable and other receivables	5,004	(4,186)
Inventories	(1,463)	1,240
Prepaid expenses and other current assets	450	638
Accounts payable	(4,517)	(4,067)
Accrued payroll	131	4,498
Accrued expenses and other liabilities	(285)	3,439
Net cash used in operating activities	(12,953)	(33,358)
Cash flows from investing activities:
Maturities of marketable securities	2,500	9,350
Purchases of property and equipment	(390)	(891)
Acquisition of business, net of cash acquired of $0 and $24,012, respectively	0	(60,622)
Net cash (used in) provided by investing activities	2,110	(52,163)
Cash flows from financing activities:
Proceeds from exercise of stock options	131	500
Net cash provided by financing activities	131	500
Effect of exchange rate changes on cash and cash equivalents	133	241
Net (decrease) in cash and cash equivalents	(10,579)	(84,780)
Cash and cash equivalents, beginning of period	26,120	124,553
Cash and cash equivalents, end of period	15,541	39,773
Supplemental disclosure of cash flow information:
Cash paid for interest	170	0
Cash paid for income taxes	42	110
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	47	76
Fair value of common stock issued for business acquisition	0	100,812
Fair value of warrants issued for business acquisition	$ 0	$ 44