Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 907	$ 1,498	$ 2,714	$ 2,867
Cost of revenues	3,231	4,701	11,431	8,128
Gross margin	(2,324)	(3,203)	(8,717)	(5,261)
Selling, general and administrative expenses	1,882	1,724	5,602	8,368
Research and development	3,119	1,491	5,059	5,690
Operating loss	(7,325)	(6,418)	(19,378)	(19,319)
Other income (expense)
Debt issuance cost amortization expense		(451)	(526)	(827)
Gain (loss) on change in warrant liability	(229)	1,092	(907)	4,992
Accretion of discount on convertible notes		(4,049)	(1,291)	(7,171)
Interest income (expense), net	(3)	(194)	(12)	(424)
Other income (expense), net	(232)	(3,602)	(2,736)	(3,430)
Net loss from continuing operations	(7,557)	(10,020)	(22,114)	(22,749)
Discontinued operations (note 8)
Loss on discontinued operations				(1,093)
Loss on impairment of property and equipment				(7,608)
Net loss from discontinued operations				(8,701)
Net loss	$ (7,557)	$ (10,020)	$ (22,114)	$ (31,450)
Basic
Loss from continuing operations	$ (0.17)	$ (0.60)	$ (0.55)	$ (1.61)
Net loss	(0.17)	(0.60)	(0.55)	(2.22)
Diluted
Loss from continuing operations	(0.17)	(0.60)	(0.55)	(1.61)
Net loss	$ (0.17)	$ (0.60)	$ (0.55)	$ (2.22)
Weighted average number of basic common shares outstanding	45,036,089	16,595,889	40,359,715	14,154,871
Weighted average number of diluted common shares outstanding	45,036,089	16,595,889	40,359,715	14,154,871