Consolidated Statements of Stockholders' Deficit (unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Dec. 31, 2017	$ (3,715)	$ 112	$ 255,294	$ (259,121)
Beginning Balance (in shares) at Dec. 31, 2017		11,157,489
Issuance of shares upon private placement, net of issuance costs	1,503	$ 12	1,491
Issuance of shares upon private placement, net of issuance costs (in shares)		1,175,612
Stock-based compensation expense	29		29
Net loss	(1,808)			(1,808)
Ending Balance at Mar. 31, 2018	(3,991)	$ 124	256,814	(260,929)
Ending Balance (in shares at Mar. 31, 2018		12,333,101
Beginning Balance at Dec. 31, 2018	(3,445)	$ 193	263,521	(267,159)
Beginning Balance (in shares) at Dec. 31, 2018		19,277,545
Stock-based compensation expense	59		59
Net loss	(2,331)			(2,331)
Ending Balance at Mar. 31, 2019	$ (5,717)	$ 193	$ 263,580	$ (269,490)
Ending Balance (in shares at Mar. 31, 2019		19,277,545