Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2020	110,271,093
Balances at Dec. 31, 2020	$ 11	$ 272,274	$ (148,881)	$ 0	$ 123,404
Issuance of common stock (in shares)	13,239,839
Issuance of common stock	$ 2	122,208	0	0	$ 122,210
Issuance of common stock upon exercise of stock options (in shares)	771,344				771,344
Issuance of common stock upon exercise of stock options	$ 0	1,240	0	0	$ 1,240
Stock-based compensation	0	5,954	0	0	5,954
Unrealized gains (losses) on available-for-sale investments	0	0	0	(3)	(3)
Net loss	$ 0	0	(49,706)	0	(49,706)
Issuance of common stock upon exercise of warrants (in shares)	1,012,540
Issuance of common stock upon exercise of warrants	$ 0	1,849	0	0	1,849
Balances (in shares) at Sep. 30, 2021	125,294,816
Balances at Sep. 30, 2021	$ 13	403,525	(198,587)	(3)	204,948
Balances (in shares) at Jun. 30, 2021	122,814,467
Balances at Jun. 30, 2021	$ 12	380,783	(181,004)	(9)	199,782
Issuance of common stock (in shares)	2,280,931
Issuance of common stock	$ 1	20,295	0	0	20,296
Issuance of common stock upon exercise of stock options (in shares)	199,418
Issuance of common stock upon exercise of stock options	$ 0	348	0	0	348
Stock-based compensation	0	2,099	0	0	2,099
Unrealized gains (losses) on available-for-sale investments	0	0	0	6	6
Net loss	$ 0	0	(17,583)	0	(17,583)
Issuance of common stock upon exercise of warrants (in shares)	0
Issuance of common stock upon exercise of warrants	$ 0	0	0	0	0
Balances (in shares) at Sep. 30, 2021	125,294,816
Balances at Sep. 30, 2021	$ 13	403,525	(198,587)	(3)	204,948
Balances (in shares) at Dec. 31, 2021	125,594,393
Balances at Dec. 31, 2021	$ 13	406,943	(219,351)	(74)	187,531
Issuance of common stock (in shares)	2,565,022
Issuance of common stock	$ 0	8,650	0	0	$ 8,650
Issuance of common stock upon exercise of stock options (in shares)	166,993				166,993
Issuance of common stock upon exercise of stock options	$ 0	214	0	0	$ 214
Stock-based compensation	0	10,194	0	0	10,194
Unrealized gains (losses) on available-for-sale investments	0	0	0	(444)	(444)
Net loss	$ 0	0	(83,840)	0	(83,840)
Issuance of common stock upon exercise of warrants (in shares)	5,000
Issuance of common stock upon exercise of warrants	$ 0	2	0	0	2
Balances (in shares) at Sep. 30, 2022	128,331,408
Balances at Sep. 30, 2022	$ 13	426,003	(303,191)	(518)	122,307
Balances (in shares) at Jun. 30, 2022	126,446,036
Balances at Jun. 30, 2022	$ 13	417,372	(273,882)	(409)	143,094
Issuance of common stock (in shares)	1,789,022
Issuance of common stock	$ 0	4,853	0	0	4,853
Issuance of common stock upon exercise of stock options (in shares)	96,350
Issuance of common stock upon exercise of stock options	$ 0	135	0	0	135
Stock-based compensation	0	3,643	0	0	3,643
Unrealized gains (losses) on available-for-sale investments	0	0	0	(109)	(109)
Net loss	$ 0	0	(29,309)	0	(29,309)
Balances (in shares) at Sep. 30, 2022	128,331,408
Balances at Sep. 30, 2022	$ 13	$ 426,003	$ (303,191)	$ (518)	$ 122,307