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	(15,836)	(15,836)
Realized foreign currency translation gain from dissolution of subsidiary	0	0	(1,202)	0	(1,202)
Unrealized foreign currency translation adjustment	0	0	(19)	0	(19)
Stock-based compensation, net	$ 0	1,349	0	0	1,349
Stock-based compensation, net (in shares)	0
Issuance of common stock, net	$ 0	25,921	0	0	25,921
Issuance of common stock, net (in shares)	1,695,877
Exercise of warrants	$ 0	4,115	0	0	4,115
Exercise of warrants (in shares)	455,139
Conversion of preferred stock into common stock	$ 0	0	0	0	0
Conversion of preferred stock into common stock (in shares)	429,242
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	(19,578)	(19,578)
Realized foreign currency translation gain from dissolution of subsidiary					0
Unrealized foreign currency translation adjustment	0	0	(4)	0	(4)
Stock-based compensation, net	$ 0	1,314	0	0	1,314
Stock-based compensation, net (in shares)	0
Issuance of common stock, net	$ 1	27,895	0	0	27,896
Issuance of common stock, net (in shares)	7,801,404
Exercise of warrants	$ 0	1	0	0	1
Exercise of warrants (in shares)	142
Balance at Dec. 31, 2021	$ 1	$ 278,873	$ (11)	$ (252,916)	$ 25,947
Balance (in shares) at Dec. 31, 2021	10,537,606