CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (56,806)	$ (63,053)
Adjustments to reconcile net loss to net cash used in operating activities:
Change in fair value of contingent consideration liability		86
Stock-based compensation expense	8,171	6,209
Depreciation and amortization	(1,413)	31
Loss on foreign currency exchange	(134)	(183)
Changes in operating assets and liabilities:
Accounts receivable	(704)	(204)
Prepaid expenses and other assets	(2,043)	3,204
Accounts payable	(1,758)	(615)
Accrued expenses and other liabilities	(3,306)	7,555
Income tax and R&D incentive receivables	(1,284)	1,690
Net cash used in operating activities	(59,277)	(45,280)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales and maturities of short-term investments	76,544
Purchases of short-term investments	(54,806)	(74,292)
Purchases of property and equipment, net	(47)	(88)
Net cash provided by (used in) investing activities	21,691	(74,380)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of deferred offering costs	(195)
Proceeds from issuance of common stock in at-the-market offerings, net	13,862	56,166
Proceeds from issuance of common stock from Employee Stock Purchase Plan	215	181
Payment of conditional economic incentive	(90)
Proceeds from exercises of stock options	61	868
Payment for tax withholding in share-based compensation	(502)	(391)
Net cash provided by financing activities	13,351	56,824
Net decrease in cash and cash equivalents and restricted cash	(24,235)	(62,836)
Cash, cash equivalents and restricted cash at beginning of period	111,131	190,335
Cash, cash equivalents and restricted cash at end of period	$ 86,896	127,499
SUPPLEMENTAL NON-CASH ACTIVITIES:
Fair value of common stock retired in exchange for issuance of common stock warrant		$ 6,176