CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2022		54,745
Common stock, beginning balance (in shares) at Dec. 31, 2022			221,721,182
Beginning balance at Dec. 31, 2022	$ 73,981	$ 1	$ 2,217	$ (48)	$ 294,874	$ 26	$ (223,089)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,689				2,689
Issuance of common stock for stock option exercises and restricted stock unit vesting, net (in shares)			348,555
Issuance of common stock for stock option exercises and restricted stock unit vesting, net	(1)		$ 3		(4)
Issuance of common stock for capital raises, net (in shares)			4,478,956
Issuance of common stock for capital raises, net	5,559		$ 45		5,514
Other comprehensive income (loss)	(1)					(1)
Net loss	(17,326)						(17,326)
Convertible preferred stock, ending balance (in shares) at Mar. 31, 2023		54,745
Common stock, ending balance (in shares) at Mar. 31, 2023			226,548,693
Ending balance at Mar. 31, 2023	64,901	$ 1	$ 2,265	(48)	303,073	25	(240,415)
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2022		54,745
Common stock, beginning balance (in shares) at Dec. 31, 2022			221,721,182
Beginning balance at Dec. 31, 2022	73,981	$ 1	$ 2,217	(48)	294,874	26	(223,089)
Increase (Decrease) in Stockholders' Equity
Net loss	(40,391)
Convertible preferred stock, ending balance (in shares) at Jun. 30, 2023		54,745
Common stock, ending balance (in shares) at Jun. 30, 2023			256,608,552
Ending balance at Jun. 30, 2023	59,242	$ 1	$ 2,566	(48)	320,181	22	(263,480)
Convertible preferred stock, beginning balance (in shares) at Mar. 31, 2023		54,745
Common stock, beginning balance (in shares) at Mar. 31, 2023			226,548,693
Beginning balance at Mar. 31, 2023	64,901	$ 1	$ 2,265	(48)	303,073	25	(240,415)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,632				2,632
Issuance of common stock for stock option exercises and restricted stock unit vesting, net (in shares)			59,859
Issuance of common stock for stock option exercises and restricted stock unit vesting, net	10		$ 1		9
Issuance of common stock for capital raises, net (in shares)			30,000,000
Issuance of common stock for capital raises, net	14,767		$ 300		14,467
Other comprehensive income (loss)	(3)					(3)
Net loss	(23,065)						(23,065)
Convertible preferred stock, ending balance (in shares) at Jun. 30, 2023		54,745
Common stock, ending balance (in shares) at Jun. 30, 2023			256,608,552
Ending balance at Jun. 30, 2023	$ 59,242	$ 1	$ 2,566	(48)	320,181	22	(263,480)
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2023	54,745	54,745
Common stock, beginning balance (in shares) at Dec. 31, 2023	256,566,804		256,688,304
Beginning balance at Dec. 31, 2023	$ 40,564	$ 1	$ 2,567	(48)	324,191	20	(286,167)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	1,761				1,761
Issuance of common stock for stock option exercises and restricted stock unit vesting, net (in shares)			758,460
Issuance of common stock for stock option exercises and restricted stock unit vesting, net	(145)		$ 8		(153)
Other comprehensive income (loss)	5					5
Net loss	(11,924)						(11,924)
Convertible preferred stock, ending balance (in shares) at Mar. 31, 2024		54,745
Common stock, ending balance (in shares) at Mar. 31, 2024			257,446,764
Ending balance at Mar. 31, 2024	$ 30,261	$ 1	$ 2,575	(48)	325,799	25	(298,091)
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2023	54,745	54,745
Common stock, beginning balance (in shares) at Dec. 31, 2023	256,566,804		256,688,304
Beginning balance at Dec. 31, 2023	$ 40,564	$ 1	$ 2,567	(48)	324,191	20	(286,167)
Increase (Decrease) in Stockholders' Equity
Net loss	$ (27,204)
Convertible preferred stock, ending balance (in shares) at Jun. 30, 2024	0	0
Common stock, ending balance (in shares) at Jun. 30, 2024	257,421,124		257,542,624
Ending balance at Jun. 30, 2024	$ 16,927	$ 0	$ 2,576	(48)	327,742	28	(313,371)
Convertible preferred stock, beginning balance (in shares) at Mar. 31, 2024		54,745
Common stock, beginning balance (in shares) at Mar. 31, 2024			257,446,764
Beginning balance at Mar. 31, 2024	30,261	$ 1	$ 2,575	(48)	325,799	25	(298,091)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	1,898				1,898
Issuance of common stock for stock option exercises and restricted stock unit vesting, net (in shares)			95,860
Issuance of common stock for stock option exercises and restricted stock unit vesting, net	45		$ 1		44
Series B Convertible Preferred Stock redemption (in shares)		(54,745)
Series B Convertible Preferred Stock redemption	0	$ (1)			1
Other comprehensive income (loss)	3					3
Net loss	$ (15,280)						(15,280)
Convertible preferred stock, ending balance (in shares) at Jun. 30, 2024	0	0
Common stock, ending balance (in shares) at Jun. 30, 2024	257,421,124		257,542,624
Ending balance at Jun. 30, 2024	$ 16,927	$ 0	$ 2,576	$ (48)	$ 327,742	$ 28	$ (313,371)