Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2016	51,068,000
Balance at Dec. 31, 2016	$ 255	$ 18,868	$ (4,708)	$ 14,415
Cashless exercise of warrants, net of issuance costs (in shares)	26,000
Cashless exercise of warrants, net of issuance costs
Stock-based compensation, net of issuance costs		703		703
Net loss			(6,893)	$ (6,893)
Cashless option exercise (in shares)				0
Balance (in shares) at Dec. 31, 2017	51,094,000
Balance at Dec. 31, 2017	$ 255	19,571	(11,601)	$ 8,225
Cashless exercise of warrants, net of issuance costs (in shares)	1,613,000
Cashless exercise of warrants, net of issuance costs	$ 9	1,862		1,871
Stock-based compensation, net of issuance costs		371		371
Net loss			(5,865)	$ (5,865)
Cashless option exercise (in shares)	663,000			1,230,002
Cashless option exercise	$ 3	(3)
Restricted share issuance (in shares)	1,043,000
Restricted share issuance	$ 5	(5)
Restricted share cancellation (in shares)	(127,000)
Restricted share cancellation	$ (1)	1
Balance (in shares) at Dec. 31, 2018	54,286,000
Balance at Dec. 31, 2018	$ 271	$ 21,797	$ (17,466)	$ 4,602