Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	51,094
Balance at Dec. 31, 2017	$ 255	$ 19,571	$ (11,601)	$ 8,225
Cashless exercise of warrants (in shares)	1,613
Cashless exercise of warrants	$ 9	1,862		1,871
Stock-based compensation, net of issuance costs		371		$ 371
Cashless option exercise (in shares)	663			1,230,002
Cashless option exercise	$ 3	(3)
Restricted share issuance (in shares)	1,043
Restricted share issuance	$ 5	(5)
Restricted share cancellation (in shares)	(127)
Restricted share cancellation	$ (1)
Restricted share cancellation		1
Net income (loss)			(5,865)	(5,865)
Restricted share cancellation (in shares)	127
Restricted share cancellation	$ 1
Balance (in shares) at Dec. 31, 2018	54,286
Balance at Dec. 31, 2018	$ 271	21,797	(17,466)	4,602
Stock-based compensation, net of issuance costs		277		$ 277
Cashless option exercise (in shares)				0
Restricted share issuance (in shares)	1,523
Restricted share issuance	$ 7	(8)		$ (1)
Restricted share cancellation (in shares)	270
Restricted share cancellation
Net income (loss)			(7,652)	(7,652)
Opening balance adjustment			98	98
Restricted share cancellation (in shares)	(270)
Restricted share cancellation
Balance (in shares) at Dec. 31, 2019	55,539
Balance at Dec. 31, 2019	$ 278	$ 22,066	$ (25,020)	$ (2,676)