Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (22,028)	$ (19,767)
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	(126)	152
Depreciation and amortization	1,735	1,992
Stock-based compensation	2,361	3,021
Change in fair value of derivative liabilities	2,023	0
Change in fair value of contingent consideration related to acquisition	(200)	(1,100)
Accretion of interest and amortization of deferred financing costs	3,554	2,622
Payable in kind interest expense on term loan facility	1,943	0
Non-cash foreign exchange (gain) loss	(400)	(326)
Loss on debt extinguishment	0	2,270
Non-cash lease expense	53	0
Changes in operating assets and liabilities:
Accounts receivable and other receivables	(5,253)	3,081
Inventories	112	(784)
Prepaid expenses and other current assets	(2,367)	275
Accounts payable	5,378	391
Accrued payroll	(1,438)	(585)
Accrued expenses and other liabilities	995	(1,116)
Net cash used in operating activities	(13,658)	(9,874)
Cash flows from investing activities:
Purchases of property and equipment	(107)	(200)
Net cash (used in) provided by investing activities	(107)	(200)
Cash flows from financing activities:
Cash paid for debt extinguishment	0	(1,310)
Net (payments) proceeds from revolving line of credit	0	(21)
Minimum tax withholding paid on behalf of employees for stock-based compensation	(2)	0
Proceeds from exercise of stock options	0	706
Net cash provided by financing activities	(2)	(625)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(68)	187
Net (decrease) increase in cash, cash equivalents and restricted cash	(13,835)	(10,512)
Cash, cash equivalents and restricted cash, beginning of period	24,731	60,599
Total cash, cash equivalents and restricted cash, end of period	10,896	50,087
Supplemental disclosure of cash flow information:
Cash paid for interest	2,065	2,107
Cash paid for income taxes	88	134
Cash paid for amounts included in the measurement of operating lease liabilities	849	0
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	$ 59	$ 147