Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Dec. 31, 2022	$ 13,572	$ 1,191	$ 1,807,855	$ (19)	$ (1,795,455)
Balance (in shares) at Dec. 31, 2022		119,155
Issuance of common stock under equity incentive plan	(208)	$ 2	(210)
Issuance of common stock under equity incentive plan (in shares)		125
Stock-based compensation expense	7,947		7,947
Net loss	(32,768)				(32,768)
Net unrealized gains (loss) on short-term investments	28			28
Comprehensive loss	(32,740)
Balance at Mar. 31, 2023	(11,429)	$ 1,193	1,815,592	9	(1,828,223)
Balance (in shares) at Mar. 31, 2023		119,280
Balance at Dec. 31, 2022	13,572	$ 1,191	1,807,855	(19)	(1,795,455)
Balance (in shares) at Dec. 31, 2022		119,155
Net loss	(74,827)
Net unrealized gains (loss) on short-term investments	13
Comprehensive loss	(74,814)
Balance at Jun. 30, 2023	(39,284)	$ 1,199	1,829,805	(6)	(1,870,282)
Balance (in shares) at Jun. 30, 2023		119,956
Balance at Mar. 31, 2023	(11,429)	$ 1,193	1,815,592	9	(1,828,223)
Balance (in shares) at Mar. 31, 2023		119,280
Issuance of common stock under equity incentive plan	(385)	$ 3	(388)
Issuance of common stock under equity incentive plan (in shares)		330
Issuance of common stock under the employee stock purchase plan	704	$ 3	701
Issuance of common stock under the employee stock purchase plan (in shares)		346
Stock-based compensation expense	13,900		13,900
Net loss	(42,059)				(42,059)
Net unrealized gains (loss) on short-term investments	(15)			(15)
Comprehensive loss	(42,074)
Balance at Jun. 30, 2023	(39,284)	$ 1,199	1,829,805	(6)	(1,870,282)
Balance (in shares) at Jun. 30, 2023		119,956
Balance at Dec. 31, 2023	(33,973)	$ 1,503	1,870,525	13	(1,906,014)
Balance (in shares) at Dec. 31, 2023		150,285
Issuance of common stock under equity incentive plan	11	$ 1	10
Issuance of common stock under equity incentive plan (in shares)		93
Stock-based compensation expense	3,375		3,375
Net loss	(3,160)				(3,160)
Net unrealized gains (loss) on short-term investments	(19)			(19)
Comprehensive loss	(3,179)
Balance at Mar. 31, 2024	(33,766)	$ 1,504	1,873,910	(6)	(1,909,174)
Balance (in shares) at Mar. 31, 2024		150,378
Balance at Dec. 31, 2023	(33,973)	$ 1,503	1,870,525	13	(1,906,014)
Balance (in shares) at Dec. 31, 2023		150,285
Net loss	(12,395)
Net unrealized gains (loss) on short-term investments	(21)
Comprehensive loss	(12,416)
Balance at Jun. 30, 2024	(37,940)	$ 1,516	1,878,961	(8)	(1,918,409)
Balance (in shares) at Jun. 30, 2024		151,578
Balance at Mar. 31, 2024	(33,766)	$ 1,504	1,873,910	(6)	(1,909,174)
Balance (in shares) at Mar. 31, 2024		150,378
Issuance of common stock under equity incentive plan	318	$ 9	309
Issuance of common stock under equity incentive plan (in shares)		872
Issuance of common stock under the employee stock purchase plan	175	$ 3	172
Issuance of common stock under the employee stock purchase plan (in shares)		328
Stock-based compensation expense	4,570		4,570
Net loss	(9,235)				(9,235)
Net unrealized gains (loss) on short-term investments	(2)			(2)
Comprehensive loss	(9,237)
Balance at Jun. 30, 2024	$ (37,940)	$ 1,516	$ 1,878,961	$ (8)	$ (1,918,409)
Balance (in shares) at Jun. 30, 2024		151,578