Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2016	$ 24	$ 315,980	$ (5)	$ (300,501)	$ 15,498
Balance, shares at Dec. 31, 2016	24,202,921
Shares sold at the market	$ 1	236			237
Shares sold at the market, shares	678,275
Common stock issuance, net of costs	$ 5	2,175			2,180
Common stock issuance, net of costs, shares	4,646,205
Other issuance	$ 2	896			898
Other issuance, shares	2,241,979
Equity-based compensation	$ 1	570			571
Equity-based compensation, shares	1,115,406
Redeemable warrants		(2,050)			(2,050)
Deemed dividends		(388)			(388)
Net comprehensive loss			16	(8,259)	(8,243)
Balance at Dec. 31, 2017	$ 33	317,419	11	(308,760)	8,703
Balance, shares at Dec. 31, 2017	32,884,786
Shares sold at the market	$ 2	801			803
Shares sold at the market, shares	2,176,392
Common stock issuance, net of costs	$ 11	2,771			2,782
Common stock issuance, net of costs, shares	11,302,372
Convertible note origination shares	$ 1	83			84
Convertible note origination shares, shares	500,000
Other issuance	$ 1	329			$ 330
Other issuance, shares	831,005				500,000
Equity-based compensation	$ 1	928			$ 929
Equity-based compensation, shares	1,040,157
Redeemable warrants		(221)			(221)
Warrants issued for building sales leaseback		1,149			1,149
Warrants issued for building sales leaseback, shares
Net comprehensive loss			(14)	(9,813)	(9,827)
Balance at Dec. 31, 2018	$ 49	$ 323,701	$ (3)	$ (318,573)	$ 5,174
Balance, shares at Dec. 31, 2018	48,734,712