Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Accumulated Comprehensive Deficit
Beginning balance (in shares) at Dec. 31, 2022		7,025,000
Beginning balance at Dec. 31, 2022	$ 76,379,000	$ 7,000	$ 357,924,000	$ (281,552,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and employee stock purchase plan ("ESPP")	24,000		24,000
Restricted stock grants, net of cancellations (in shares)		230,000
Restricted stock grants, net of cancellations	3,292,000		3,292,000
Cancellation of shares for payment of withholding tax (in shares)		(31,000)
Cancellation of shares for payment of withholding tax	(381,000)		(381,000)
ESPP shares issued (in shares)		2,000
ESPP shares issued	15,000		15,000
Common shares issued in settlement and prepayment of notes payable (in shares)		1,572,000
Common shares issued in settlement and prepayment of notes payable	15,246,000	$ 2,000	15,244,000
Net loss	(17,684,000)			(17,684,000)
Ending balance (in shares) at Sep. 30, 2023		8,798,000
Ending balance at Sep. 30, 2023	76,891,000	$ 9,000	376,118,000	(299,236,000)
Beginning balance (in shares) at Jun. 30, 2023		8,150,000
Beginning balance at Jun. 30, 2023	74,489,000	$ 8,000	368,584,000	(294,103,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and employee stock purchase plan ("ESPP")	6,000		6,000
Restricted stock grants, net of cancellations (in shares)		72,000
Restricted stock grants, net of cancellations	1,334,000		1,334,000
Cancellation of shares for payment of withholding tax (in shares)		(8,000)
Cancellation of shares for payment of withholding tax	(89,000)		(89,000)
ESPP shares issued (in shares)		1,000
ESPP shares issued	7,000		7,000
Common shares issued in settlement and prepayment of notes payable (in shares)		583,000
Common shares issued in settlement and prepayment of notes payable	6,277,000	$ 1,000	6,276,000
Net loss	(5,133,000)			(5,133,000)
Ending balance (in shares) at Sep. 30, 2023		8,798,000
Ending balance at Sep. 30, 2023	$ 76,891,000	$ 9,000	376,118,000	(299,236,000)
Beginning balance (in shares) at Dec. 31, 2023	9,347,979	9,348,000
Beginning balance at Dec. 31, 2023	$ 75,390,000	$ 9,000	381,329,000	(305,948,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and employee stock purchase plan ("ESPP")	16,000		16,000
Restricted stock grants, net of cancellations (in shares)		683,000
Restricted stock grants, net of cancellations	3,507,000	$ 1,000	3,506,000
Cancellation of shares for payment of withholding tax (in shares)		(88,000)
Cancellation of shares for payment of withholding tax	(217,000)		(217,000)
ESPP shares issued (in shares)		5,000
ESPP shares issued	5,000		5,000
Issuance of Common Stock for Pre-Funded Warrants Exercise (in shares)		844,061
Issuance of Common Stock for Pre-Funded Warrants Exercise	0	$ 1,000	(1,000)
Issuance of Common Stock, Warrants, and Pre-Funded Warrants in connection with Common Stock Offering, net of issuance costs (in shares)		1,065,000
Issuance of Common Stock, Warrants, and Pre-Funded Warrants in connection with Common Stock Offering, net of issuance costs	3,351,000	$ 1,000	3,350,000
Net loss	$ (44,306,000)			(44,306,000)
Ending balance (in shares) at Sep. 30, 2024	11,857,234	11,857,000
Ending balance at Sep. 30, 2024	$ 37,746,000	$ 12,000	387,988,000	(350,254,000)
Beginning balance (in shares) at Jun. 30, 2024		10,625,000
Beginning balance at Jun. 30, 2024	42,901,000	$ 11,000	386,775,000	(343,885,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and employee stock purchase plan ("ESPP")	7,000		7,000
Restricted stock grants, net of cancellations (in shares)		417,000
Restricted stock grants, net of cancellations	1,243,000		1,243,000
Cancellation of shares for payment of withholding tax (in shares)		(33,000)
Cancellation of shares for payment of withholding tax	(39,000)		(39,000)
ESPP shares issued (in shares)		4,000
ESPP shares issued	3,000		3,000
Issuance of Common Stock for Pre-Funded Warrants Exercise (in shares)		844,061
Issuance of Common Stock for Pre-Funded Warrants Exercise	0	$ 1,000	(1,000)
Net loss	$ (6,369,000)			(6,369,000)
Ending balance (in shares) at Sep. 30, 2024	11,857,234	11,857,000
Ending balance at Sep. 30, 2024	$ 37,746,000	$ 12,000	$ 387,988,000	$ (350,254,000)