Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2019	$ 0	$ 218,278	$ 1,214	$ (217,502)	$ 1,990
Balance (in shares) at Dec. 31, 2019	155,802
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(4,568)	(4,568)
Foreign currency translation adjustments	0	0	(3)	0	(3)
Stock-based compensation and stock awards, net	$ 0	380	0	0	380
Stock-based compensation and stock awards, net (in shares)	0
Issuance of common and preferred stock, net	$ 0	9,616	0	0	9,616
Issuance of common and preferred stock, net (in shares)	340,261
Exercise of warrants	$ 0	289	0	0	289
Exercise of warrants (in shares)	29,933
Conversion of preferred stock into common stock	$ 0	0	0	0	0
Conversion of preferred stock into common stock (in shares)	378,751
Balance at Mar. 31, 2020	$ 0	228,563	1,211	(222,070)	7,704
Balance (in shares) at Mar. 31, 2020	904,747
Balance at Dec. 31, 2019	$ 0	218,278	1,214	(217,502)	1,990
Balance (in shares) at Dec. 31, 2019	155,802
Balance at Dec. 31, 2020	$ 0	249,663	(7)	(233,338)	16,318
Balance (in shares) at Dec. 31, 2020	2,736,060
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(5,221)	(5,221)
Foreign currency translation adjustments	0	0	(3)	0	(3)
Stock-based compensation and stock awards, net	$ 0	355	0	0	355
Stock-based compensation and stock awards, net (in shares)	0
Issuance of common and preferred stock, net	$ 0	18,902	0	0	18,902
Issuance of common and preferred stock, net (in shares)	3,795,816
Exercise of warrants	$ 0	1	0	0	1
Exercise of warrants (in shares)	66
Balance at Mar. 31, 2021	$ 0	$ 268,921	$ (10)	$ (238,559)	$ 30,352
Balance (in shares) at Mar. 31, 2021	6,531,942