UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2022		184,135,714
Beginning balance at Dec. 31, 2022	$ 5,230	$ 2	$ 1,562,247	$ 6	$ (1,557,025)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from sale of stock under employee stock purchase plan (in shares)		103,500
Proceeds from sale of stock under    employee stock purchase plan	34		34
Stock-based compensation expense	2,489		2,489
Restricted stock unit vesting (in shares)		1,596,732
Net loss	(26,876)				(26,876)
Ending balance (in shares) at Mar. 31, 2023		185,835,946
Ending balance at Mar. 31, 2023	$ (19,123)	$ 2	1,564,770	6	(1,583,901)
Beginning balance (in shares) at Dec. 31, 2023	194,582,539	194,582,539
Beginning balance at Dec. 31, 2023	$ (30,584)	$ 2	1,578,358	6	(1,608,950)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)		13,261,311
Issuance of common stock, net of    issuance costs	18,740		18,740
Proceeds from sale of stock under employee stock purchase plan (in shares)		92,321
Proceeds from sale of stock under    employee stock purchase plan	$ 70		70
Exercise of options (in shares)	280,260	280,260
Exercise of options	$ 141		141
Stock-based compensation expense	2,360		2,360
Restricted stock unit vesting (in shares)		1,237,718
Net loss	$ (17,985)				(17,985)
Ending balance (in shares) at Mar. 31, 2024	209,454,149	209,454,149
Ending balance at Mar. 31, 2024	$ (27,258)	$ 2	$ 1,599,669	$ 6	$ (1,626,935)