CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)
Balances at Dec. 31, 2022	$ 79,998	$ 390	$ 1,493,469	$ (1,413,642)	$ (219)
Balances (in shares) at Dec. 31, 2022		390,262,524
Increase (Decrease) in Stockholders' Equity
Net loss	(38,122)			(38,122)
Other comprehensive income (loss)	75				75
Foreign currency translation adjustment	(16)				(16)
Issuances of common stock and pre-funded warrant to purchase common stock in public offering, net of issuance costs	213,337	$ 68	213,269
Issuances of common stock and pre-funded warrant to purchase common stock in public offering, net of issuance costs (in shares)		68,007,741
Issuances of common stock in connection with exercise of warrants	59,835	$ 45	59,790
Issuances of common stock in connection with exercise of warrants (in shares)		44,983,193
Stock-based compensation related to issuance of common stock and options for services	112	$ 1	111
Stock-based compensation related to issuance of common stock and options for services (in shares)		9,360
Issuance of common stock under equity plans	7,875	$ 5	7,870
Issuance of common stock under equity plans (in shares)		5,469,028
Stock-based compensation for equity-based awards to employees and directors	2,961		2,961
Balances at Mar. 31, 2023	326,055	$ 509	1,777,470	(1,451,764)	(160)
Balances (in shares) at Mar. 31, 2023		508,731,846
Balances at Dec. 31, 2022	79,998	$ 390	1,493,469	(1,413,642)	(219)
Balances (in shares) at Dec. 31, 2022		390,262,524
Increase (Decrease) in Stockholders' Equity
Net loss	(87,349)
Foreign currency translation adjustment	(15)
Balances at Jun. 30, 2023	298,427	$ 522	1,799,841	(1,500,991)	(945)
Balances (in shares) at Jun. 30, 2023		521,942,104
Balances at Mar. 31, 2023	326,055	$ 509	1,777,470	(1,451,764)	(160)
Balances (in shares) at Mar. 31, 2023		508,731,846
Increase (Decrease) in Stockholders' Equity
Net loss	(49,227)			(49,227)
Other comprehensive income (loss)	(786)				(786)
Foreign currency translation adjustment	1				1
Issuances of common stock in connection with exercise of warrants	17,767	$ 13	17,754
Issuances of common stock in connection with exercise of warrants (in shares)		12,842,857
Stock-based compensation related to issuance of common stock and options for services	99		99
Stock-based compensation related to issuance of common stock and options for services (in shares)		6,327
Issuance of common stock under equity plans	573		573
Issuance of common stock under equity plans (in shares)		361,074
Stock-based compensation for equity-based awards to employees and directors	3,945		3,945
Balances at Jun. 30, 2023	298,427	$ 522	1,799,841	(1,500,991)	(945)
Balances (in shares) at Jun. 30, 2023		521,942,104
Balances at Dec. 31, 2023	247,949	$ 545	1,844,988	(1,597,769)	185
Balances (in shares) at Dec. 31, 2023		544,912,215
Increase (Decrease) in Stockholders' Equity
Net loss	(55,390)			(55,390)
Other comprehensive income (loss)	(448)				(448)
Foreign currency translation adjustment	(10)				(10)
Issuances of common stock and pre-funded warrant to purchase common stock in public offering, net of issuance costs	141,000	$ 42	140,958
Issuances of common stock and pre-funded warrant to purchase common stock in public offering, net of issuance costs (in shares)		41,999,998
Issuances of common stock in connection with exercise of warrants	49		49
Issuances of common stock in connection with exercise of warrants (in shares)		37,640
Stock-based compensation related to issuance of common stock and options for services	92		92
Stock-based compensation related to issuance of common stock and options for services (in shares)		2,462
Issuance of common stock under equity plans	6,749	$ 4	6,745
Issuance of common stock under equity plans (in shares)		4,211,493
Stock-based compensation for equity-based awards to employees and directors	4,877		4,877
Balances at Mar. 31, 2024	344,868	$ 591	1,997,709	(1,653,159)	(273)
Balances (in shares) at Mar. 31, 2024		591,163,808
Balances at Dec. 31, 2023	247,949	$ 545	1,844,988	(1,597,769)	185
Balances (in shares) at Dec. 31, 2023		544,912,215
Increase (Decrease) in Stockholders' Equity
Net loss	(122,773)
Foreign currency translation adjustment	(31)
Employee stock purchases	366	$ 366
Employee stock purchases (in shares)		201,052
Balances at Jun. 30, 2024	306,695	$ 601	2,027,173	(1,720,542)	(537)
Balances (in shares) at Jun. 30, 2024		601,048,108
Balances at Mar. 31, 2024	344,868	$ 591	1,997,709	(1,653,159)	(273)
Balances (in shares) at Mar. 31, 2024		591,163,808
Increase (Decrease) in Stockholders' Equity
Net loss	(67,383)			(67,383)
Other comprehensive income (loss)	(243)				(243)
Foreign currency translation adjustment	(21)				(21)
Offering expenses	(271)		(271)
Issuances of common stock in connection with exercise of warrants	365		365
Issuances of common stock in connection with exercise of warrants (in shares)		281,211
Stock-based compensation related to issuance of common stock and options for services	16	$ 1	15
Stock-based compensation related to issuance of common stock and options for services (in shares)		1,916
Issuance of common stock under equity plans	16,373	$ 9	16,364
Issuance of common stock under equity plans (in shares)		9,400,121
Stock-based compensation for equity-based awards to employees and directors	12,625		12,625
Balances at Jun. 30, 2024	$ 306,695	$ 601	$ 2,027,173	$ (1,720,542)	$ (537)
Balances (in shares) at Jun. 30, 2024		601,048,108