Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (19,767)	$ (21,314)
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	152	23
Depreciation and amortization	1,992	2,313
Stock-based compensation	3,021	2,954
Change in fair value of contingent consideration related to acquisition	(1,100)	1,200
Accretion of interest & amortization of deferred financing costs on debt	2,622	2,547
Non-cash foreign exchange (gain) loss	(326)	4
Loss on debt extinguishment	2,270	0
Changes in operating assets and liabilities:
Accounts receivable and other receivables	3,081	5,004
Inventories	(784)	(1,463)
Prepaid expenses and other current assets	275	450
Accounts payable	391	(4,517)
Accrued payroll	(585)	131
Accrued expenses and other liabilities	(1,116)	(285)
Net cash used in operating activities	(9,874)	(12,953)
Cash flows from investing activities:
Maturities of marketable securities	0	2,500
Purchases of property and equipment	(200)	(390)
Net cash (used in) provided by investing activities	(200)	2,110
Cash flows from financing activities:
Cash paid for debt extinguishment	(1,310)	0
Net proceeds from revolving line of credit	(21)	0
Proceeds from exercise of stock options	706	131
Net cash (used in) provided by financing activities	(625)	131
Effect of exchange rate changes on cash and cash equivalents and restricted cash	187	133
Net increase (decrease) in cash and cash equivalents and restricted cash	(10,512)	(10,579)
Cash, cash equivalents and restricted cash, beginning of period	60,599	28,121
Cash, cash equivalents and restricted cash, end of period	50,087	17,542
Restricted cash, beginning of period	2,608	2,001
Cash and cash equivalents, beginning of period	57,991	26,120
Restricted cash, end of period	2,067	2,001
Cash and cash equivalents, end of period	48,020	15,541
Supplemental disclosure of cash flow information:
Cash paid for interest	2,107	170
Cash paid for income taxes	134	42
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	$ 147	$ 47