CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (86,990)	$ (59,273)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	635	607
Stock-based compensation expense	19,276	10,226
Revaluation of contingent consideration	(600)	(2,400)
Changes in operating assets and liabilities:
Accounts receivable	138	26
Prepaid expenses and other assets	(9,293)	3,408
Accounts payable	(1,079)	(2,319)
Accrued expenses	6,349	1,273
Net cash used in operating activities	(71,564)	(48,452)
Cash flows from investing activities:
Purchases of property and equipment	(868)	(500)
Purchases of marketable securities	(135,675)	(118,729)
Proceeds from sales and maturities of marketable securities	175,213	129,155
Net cash provided by investing activities	38,670	9,926
Cash flows from financing activities:
Proceeds from issuance of common stock under the at-the-market sales agreement, net of issuance costs	26,714	72,744
Payments of employee withholding taxes related to restricted stock unit award vesting	(102)	(34)
Proceeds from exercise of employee stock options and the issuance of stock	45	120
Net cash provided by financing activities	26,657	72,830
Net (decrease) increase in cash and cash equivalents	(6,237)	34,304
Cash and cash equivalents at beginning of period	45,277	27,349
Cash and cash equivalents at end of period	39,040	61,653
Supplemental disclosure of non-cash investing and financing activities:
Additions to property and equipment included in accounts payable	$ 376	$ 4