Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	The September 2021 ATM [Member] Common Stock [Member]	The September 2021 ATM [Member] Additional Paid-in Capital [Member]	The September 2021 ATM [Member] Retained Earnings [Member]	The September 2021 ATM [Member] AOCI Attributable to Parent [Member]	The September 2021 ATM [Member]	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)						10,958,908
Issuance of common stock						$ 1	101,913	0	0	101,914
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
Issuance of common stock upon exercise of stock options (in shares)						571,926				571,926
Issuance of common stock upon exercise of stock options						$ 0	892	0	0	$ 892
Stock-based compensation						0	3,855	0	0	3,855
Unrealized gains (losses) on available-for-sale investments						0	0	0	(9)	(9)
Net loss						$ 0	0	(32,123)	0	(32,123)
Issuance of common stock upon exercise of warrants (in shares)						1,012,540
Balances (in shares) at Jun. 30, 2021						122,814,467
Balances at Jun. 30, 2021						$ 12	380,783	(181,004)	(9)	199,782
Balances (in shares) at Mar. 31, 2021						117,963,912
Balances at Mar. 31, 2021						$ 12	341,116	(164,888)	(5)	176,235
Issuance of common stock (in shares)						4,304,541
Issuance of common stock						$ 0	36,202	0	0	36,202
Issuance of common stock upon exercise of warrants (in shares)						181,818
Issuance of common stock upon exercise of warrants						$ 0	200	0	0	200
Issuance of common stock upon exercise of stock options (in shares)						364,196
Issuance of common stock upon exercise of stock options						$ 0	661	0	0	661
Stock-based compensation						0	2,604	0	0	2,604
Unrealized gains (losses) on available-for-sale investments						0	0	0	(4)	(4)
Net loss						$ 0	0	(16,116)	0	(16,116)
Issuance of common stock upon exercise of warrants (in shares)						181,818
Balances (in shares) at Jun. 30, 2021						122,814,467
Balances at Jun. 30, 2021						$ 12	380,783	(181,004)	(9)	199,782
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)					776,000	776,000
Issuance of common stock						$ 0	3,797	0	0	3,797
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
Issuance of common stock upon exercise of stock options (in shares)						70,643				70,643
Issuance of common stock upon exercise of stock options						$ 0	79	0	0	$ 79
Stock-based compensation						0	6,551	0	0	6,551
Unrealized gains (losses) on available-for-sale investments						0	0	0	(335)	(335)
Net loss						$ 0	0	(54,531)	0	(54,531)
Issuance of common stock upon exercise of warrants (in shares)						5,000
Balances (in shares) at Jun. 30, 2022						126,446,036
Balances at Jun. 30, 2022						$ 13	417,372	(273,882)	(409)	143,094
Balances (in shares) at Mar. 31, 2022						125,840,811
Balances at Mar. 31, 2022						$ 13	411,113	(244,452)	(309)	166,365
Issuance of common stock (in shares)	560,000
Issuance of common stock	$ 0	$ 2,805	$ 0	$ 0	$ 2,805
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
Issuance of common stock upon exercise of stock options (in shares)						40,225
Issuance of common stock upon exercise of stock options						$ 0	31	0	0	31
Stock-based compensation						0	3,421	0	0	3,421
Unrealized gains (losses) on available-for-sale investments						0	0	0	(100)	(100)
Net loss						$ 0	0	(29,430)	0	(29,430)
Issuance of common stock upon exercise of warrants (in shares)						5,000
Balances (in shares) at Jun. 30, 2022						126,446,036
Balances at Jun. 30, 2022						$ 13	$ 417,372	$ (273,882)	$ (409)	$ 143,094