Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2019	$ 426	$ 117,557	$ (72,872)	$ 45,111
Balance (in shares) at Dec. 31, 2019	42,628,560
Value of share-based arrangements		125		125
Net loss			(2,885)	(2,885)
Balance at Mar. 31, 2020	$ 426	117,682	(75,757)	42,351
Balance (in shares) at Mar. 31, 2020	42,628,560
Balance at Dec. 31, 2019	$ 426	117,557	(72,872)	$ 45,111
Balance (in shares) at Dec. 31, 2019	42,628,560
Issuance of common stock upon exercise of stock options (in shares)				1,967,562
Balance at Dec. 31, 2020	$ 433	118,269	(78,080)	$ 40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Issuance of common stock upon exercise of stock options	$ 1			$ 1
Issuance of common stock upon exercise of stock options (in shares)	23,804			155,000
Value of share-based arrangements		361		$ 361
Net loss			(1,076)	(1,076)
Balance at Mar. 31, 2021	$ 434	$ 118,630	$ (79,156)	$ 39,908
Balance (in shares) at Mar. 31, 2021	43,371,691