CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) - USD ($) $ in Thousands	Total	Business combination and PIPE [Member]	Previously Reported [Member]	Revision of Prior Period, Adjustment [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member] Previously Reported [Member]	Convertible Preferred Stock [Member] Revision of Prior Period, Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Business combination and PIPE [Member]	Common Stock [Member] Previously Reported [Member]	Common Stock [Member] Revision of Prior Period, Adjustment [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Business combination and PIPE [Member]	Additional Paid-in Capital [Member] Previously Reported [Member]	Additional Paid-in Capital [Member] Revision of Prior Period, Adjustment [Member]	Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Previously Reported [Member]
Beginning balance at Dec. 31, 2019						$ 79,204	$ (79,204)
Beginning balance, Shares at Dec. 31, 2019						8,606,780	(8,606,780)
Beginning balance at Dec. 31, 2019	$ 48,604		$ 48,604					$ 15		$ 9	$ 6	$ 84,103		$ 4,905	$ 79,198		$ (35,514)	$ (35,514)
Beginning balance, Shares at Dec. 31, 2019								151,014,472		8,031,018	142,983,454
Share-based compensation	881											881
Issuance of common stock upon exercise of stock options	5											5
Issuance of common stock upon exercise of stock options, Shares								83,732
Net loss	(6,852)																(6,852)
Ending balance at Mar. 31, 2020
Ending balance, Shares at Mar. 31, 2020					0
Ending balance at Mar. 31, 2020	42,638							$ 15				84,989					(42,366)
Ending balance, Shares at Mar. 31, 2020								151,098,204
Beginning balance at Dec. 31, 2020						$ 79,204	$ (79,204)
Beginning balance, Shares at Dec. 31, 2020						8,606,780	(8,606,780)
Beginning balance at Dec. 31, 2020	26,913		$ (52,291)	$ 79,204				$ 15		$ 9	$ 6	87,982		$ 8,784	$ 79,198	$ 0	(61,084)	$ (61,084)
Beginning balance, Shares at Dec. 31, 2020								151,365,509		8,069,693	143,295,816
Share-based compensation	4,513											4,513
Issuance of common stock upon exercise of stock options	$ 198											198
Issuance of common stock upon exercise of stock options, Shares	701,139							701,139
Business combination and PIPE financing, net of acquired private placement warrant		$ 557,763							$ 6				$ 557,757
Business combination and PIPE financing, net of acquired private placement warrant, Shares									59,343,104
Offering cost in connection with Business combination and PIPE financing		$ (47,983)											$ (47,983)
Issuance of common stock upon release of restricted stock units, Shares								41,408
Unrealized loss on available-for-sale securities	$ (29)															(29)
Net loss	(19,458)																(19,458)
Ending balance at Mar. 31, 2021					$ 0
Ending balance, Shares at Mar. 31, 2021					0
Ending balance at Mar. 31, 2021	$ 521,917							$ 21				$ 602,467				$ (29)	$ (80,542)
Ending balance, Shares at Mar. 31, 2021								211,451,160