Condensed Consolidated Statements of Stockholders Deficit - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (shares) at Dec. 31, 2018		39,053,312
Beginning balance at Dec. 31, 2018	$ (13,124)	$ 39	$ 308,018	$ 32	$ (321,213)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,852)				(8,852)
Share-based compensation	98		98
Common stock sales (in shares)		1,666,667
Common stock issued	2,500	$ 2	2,498
Equity instrument exercises (in shares)		2,250
Equity instrument exercises	4		4
Other	(94)			(94)
Ending balance (shares) at Mar. 31, 2019		40,722,229
Ending balance at Mar. 31, 2019	$ (19,468)	$ 41	310,618	(62)	(330,065)
Beginning balance (shares) at Dec. 31, 2019	51,055,159	51,055,159
Beginning balance at Dec. 31, 2019	$ (27,728)	$ 51	319,275	(227)	(346,827)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,423)				(2,423)
Share-based compensation	47		47
Common stock sales (in shares)		15,078,729
Common stock issued	4,651	$ 15	4,636
Other	$ 182			182
Ending balance (shares) at Mar. 31, 2020	66,133,888	66,133,888
Ending balance at Mar. 31, 2020	$ (25,271)	$ 66	$ 323,958	$ (45)	$ (349,250)