Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (56,927)	$ (53,759)
Adjustments to reconcile net loss to net cash used in operating activities:
Deferred income taxes	(3,678)	0
Bad debt expense	537	571
Depreciation and amortization	5,264	5,919
Stock-based compensation	8,294	8,811
Change in fair value of derivative liabilities	(9,540)	(8,305)
Change in fair value of contingent consideration related to acquisition	(900)	(4,300)
Accretion of interest and amortization of deferred financing costs	10,495	8,242
Payable in kind interest expense on term loan facility	5,941	0
Non-cash foreign exchange loss	548	464
Loss on debt extinguishment	11,756	2,270
Non-cash lease expense	179	0
Changes in operating assets and liabilities:
Accounts receivable and other receivables	(1,560)	9,114
Inventories	(768)	2,146
Prepaid expenses and other current assets	812	1,610
Accounts payable	886	(1,034)
Accrued payroll	4,157	(749)
Accrued expenses and other liabilities	41	(60)
Net cash used in operating activities	(24,463)	(29,060)
Cash flows from investing activities:
Purchases of property and equipment	(337)	(476)
Net cash used in investing activities	(337)	(476)
Cash flows from financing activities:
Cash paid for debt extinguishment	0	(1,310)
Deferred financing costs	(3,977)	(391)
Net proceeds from revolving line of credit	0	9,979
Proceeds from sale of common stock under employee stock purchase plan	209	997
Proceeds from the sale of at-the-market shares	0	1,829
Minimum tax withholding paid on behalf of employees for stock-based compensation	(128)	(389)
Proceeds from exercise of stock options	0	892
Proceeds from common stock offering and pre-paid warrants, net of expenses paid	51,985	0
Net cash provided by financing activities	48,089	11,607
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(233)	(256)
Net increase (decrease) in cash, cash equivalents and restricted cash	23,056	(18,185)
Cash, cash equivalents and restricted cash, beginning of period	24,731	60,599
Total cash, cash equivalents and restricted cash, end of period	47,787	42,414
Supplemental disclosure of cash flow information:
Cash paid for interest	6,487	8,845
Cash paid for income taxes	182	184
Cash paid for amounts included in the measurement of operating lease liabilities	2,554	0
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	37	20
Fair value of embedded derivative issued	20,447	15,655
Fair value of warrants issued in connection with the Facility Agreement	0	10,406
Conversion of debt to equity	$ 3,289	$ 0