Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 6,857	$ 10,132	$ 23,470	$ 28,284
Cost of revenues	5,370	7,425	18,605	21,153
Gross profit	1,487	2,707	4,865	7,131
Operating expenses:
Research and development	1,155	762	3,211	3,955
Selling, general and administrative	1,877	2,322	6,519	8,549
Severance and other charges	235	571	(384)	1,945
Total operating expenses	3,267	3,655	9,346	14,449
Loss from operations	(1,780)	(948)	(4,481)	(7,318)
Other income (expense):
Interest expense, net	(93)	(458)	(260)	(1,541)
Gain on bifurcated derivative liability	0	0	0	2,754
Loss on extinguishment of debt	0	(10,780)	(194)	(12,410)
Gain (loss) on change in fair value of liability-classified warrants	738	(705)	404	883
Gain on sale of DuraFit	805	0	805	0
Other (expense) income, net	(149)	196	(67)	824
Total other income (expense)	1,301	(11,747)	688	(9,490)
Loss from operations before income taxes	(479)	(12,695)	(3,793)	(16,808)
Income tax (benefit) expense	(119)	(113)	49	(1,232)
Net loss	(360)	(12,582)	(3,842)	(15,576)
Foreign currency translation adjustments	129	(190)	350	(460)
Comprehensive loss	$ (231)	$ (12,772)	$ (3,492)	$ (16,036)
Basic and diluted net loss per common share:
Net loss (in dollars per share)	$ (0.02)	$ (2.14)	$ (0.24)	$ (3.49)
Weighted average shares outstanding - basic and diluted (in shares)	15,760	5,876	15,724	4,462