CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net loss	$ (40,501)	$ (130,722)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		257
Non-cash lease expense	145	3,790
Non-cash gain on lease termination and remeasurement	(8,872)
Accretion of short-term investment discounts	(1,245)	(2,486)
Stock-based compensation expense	15,889	30,785
Changes in operating assets and liabilities:
Interest receivable	153	(77)
Prepaid expenses and other current assets and prepaid expenses to related party	2,858	2,633
Other assets	122	(813)
Income tax payable		(128)
Accounts payable, accrued expenses, other liabilities and amount due to related party	(32,687)	3,045
Net cash used in operating activities	(64,138)	(93,716)
Cash flows from investing activities
Purchase of short-term investments		(116,046)
Maturities of short-term investments	90,000	128,813
Net cash provided by (used in) investing activities	90,000	12,767
Cash flows from financing activities
Proceeds from issuance of common stock in public offering, net of underwriting discounts, commissions and offering costs		70,169
Proceeds from issuance of stock under the 2020 Employee Stock Purchase Plan	21	315
Net cash provided by financing activities	21	70,484
Net increase (decrease) in cash, cash equivalents, and restricted cash	25,883	(10,465)
Cash, cash equivalents, and restricted cash at beginning of period	90,973	106,944
Cash, cash equivalents, and restricted cash at end of period	116,856	96,479
Non-cash investing and financing activities
Unrealized (loss) gain on available-for-sale securities	(72)	268
Deferred offering costs included in accounts payable and accrued expenses		46
Reduction of right-of-use asset due to modification and remeasurement	2,044
Supplemental disclosure of cash flows
Income taxes paid, net of refunds		351
Cash and cash equivalents	116,856	95,627
Restricted cash		852
Total cash, cash equivalents, and restricted cash	$ 116,856	$ 96,479