Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Rights Offering [Member] Common Stock [Member]	Rights Offering [Member] Additional Paid-in Capital [Member]	Rights Offering [Member] AOCI Attributable to Parent [Member]	Rights Offering [Member] Retained Earnings [Member]	Rights Offering [Member]	Private Placement [Member] Common Stock [Member]	Private Placement [Member] Additional Paid-in Capital [Member]	Private Placement [Member] AOCI Attributable to Parent [Member]	Private Placement [Member] Retained Earnings [Member]	Private Placement [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2021											29,716
Balance at Dec. 31, 2021											$ 29	$ 271,861	$ 0	$ (236,200)	$ 35,690
Issuance of shares (in shares)	7,317
Issuance of shares	$ 7	$ 14,857	$ 0	$ 0	$ 14,864
Issuance of shares under employee stock purchase plan (in shares)											188
Issuance of shares under employee stock purchase plan											$ 1	485	0	0	486
Issuance of shares upon exercise of warrants (in shares)											14
Issuance of shares upon exercise of warrants											$ 0	26	0	0	26
Stock-based compensation expense											0	5,191	0	0	5,191
Net loss											$ 0	0	0	(58,505)	(58,505)
Balance (in shares) at Dec. 31, 2022											37,235
Balance at Dec. 31, 2022											$ 37	292,420	0	(294,705)	(2,248)
Issuance of shares under employee stock purchase plan (in shares)											347
Issuance of shares under employee stock purchase plan											$ 1	394	0	0	395
Issuance of shares upon exercise of warrants (in shares)											7,238
Issuance of shares upon exercise of warrants											$ 7	14,821	0	0	14,828
Stock-based compensation expense											0	7,181	0	0	7,181
Net loss											$ 0	0	0	(42,210)	(42,210)
Issuance of common stock as part of debt extinguishment (in shares)						10,023
Issuance of common stock as part of debt extinguishment						$ 10	$ 65,233	$ 0	$ 0	$ 65,243
Issuance of common stock upon exercise of stock options (in shares)											301
Issuance of common stock upon exercise of stock options											$ 0	1,171	0	0	1,171
Balance (in shares) at Dec. 31, 2023											55,144
Balance at Dec. 31, 2023											$ 55	$ 381,220	$ 0	$ (336,915)	$ 44,360