Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Revenue, net	$ 4,860	$ 4,739	$ 14,754	$ 13,494
Cost of goods sold	3,132	4,119	9,589	11,143
Gross margin	1,728	620	5,165	2,351
Operating expense:
Research and development	1,188	1,519	3,635	5,140
Selling, general and administrative	7,997	9,908	24,547	36,458
Restructuring	198		2,361
Total operating expense	9,383	11,427	30,543	41,598
Operating loss	(7,655)	(10,807)	(25,378)	(39,247)
Other income (expense), net:
Other income	121		121
Interest expense	(1,596)	(3,688)	(10,602)	(12,380)
Costs associated with aborted 2015 IPO				(3,978)
Change in fair value of derivatives	(27)		(662)	443
Total other income (expense), net	(1,502)	(3,688)	(11,143)	(15,915)
Loss before income taxes	(9,157)	(14,495)	(36,521)	(55,162)
Income tax expense	0	0	0	0
Net loss	$ (9,157)	$ (14,495)	$ (36,521)	$ (55,162)
Net loss per share of common shares outstanding - basic and diluted	$ (0.72)		$ (4.35)
Weighted average common shares outstanding - basic and diluted	12,679,521		8,385,262