Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)	Treasury Stock
Common stock beginning balance (in shares) at Dec. 31, 2022		189,214,000
Beginning balance at Dec. 31, 2022	$ 117,124	$ 189	$ 0	$ 1,709,144	$ (1,589,720)	$ (428)	$ (2,061)
Preferred stock beginning balance (in shares) at Dec. 31, 2022			0
Stock-based compensation	3,415			3,415
Issuance of common stock under Equity Incentive Plans (in shares)		1,216,000
Issuance of common stock under Equity Incentive Plans	0	$ 1		(1)
Repurchase of common stock	(824)						(824)
Net loss	(31,934)				(31,934)
Unrealized gain (loss) on investments	265					265
Common stock ending balance (in shares) at Mar. 31, 2023		190,430,000
Ending balance at Mar. 31, 2023	$ 88,046	$ 190	$ 0	1,712,558	(1,621,654)	(163)	(2,885)
Preferred stock ending balance (in shares) at Mar. 31, 2023			0
Common stock beginning balance (in shares) at Dec. 31, 2023	245,792,668	245,793,000
Beginning balance at Dec. 31, 2023	$ 93,110	$ 245	$ 0	1,862,558	(1,766,839)	31	(2,885)
Preferred stock beginning balance (in shares) at Dec. 31, 2023	0		0
Stock-based compensation		$ 4,302		4,302
Issuance of preferred stock, net of fees (in shares)			2,304,000
Issuance of preferred stock, net of fees	$ 241,575		$ 23	241,552
Issuance of common stock under Equity Incentive Plans (in shares)		1,972,000
Issuance of common stock under Equity Incentive Plans	88	$ 3		85
Repurchase of common stock	(1,730)						(1,730)
Net loss	(48,397)				(48,397)
Unrealized gain (loss) on investments	$ (81)					(81)
Common stock ending balance (in shares) at Mar. 31, 2024	247,764,761	247,765,000
Ending balance at Mar. 31, 2024	$ 288,867	$ 248	$ 23	$ 2,108,497	$ (1,815,236)	$ (50)	$ (4,615)
Preferred stock ending balance (in shares) at Mar. 31, 2024	2,304,147		2,304,000