Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (24,254)	$ (18,701)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	313	309
Stock-based compensation	3,632	4,643
Accrued interest	0	1
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(2,278)	(1,307)
Accounts payable and accrued expenses	(2,433)	117
Right-of-use assets and lease liabilities, net	(116)	(56)
Net cash used in operating activities	(25,136)	(14,994)
Cash flows from investing activities
Purchases of property and equipment	(10)	(501)
Net cash used in investing activities	(10)	(501)
Cash flows from financing activities
Payment of initial public offering costs	0	(1,911)
Payments for taxes related to net settlement of equity awards1	(405)	0
Net cash used in financing activities	(405)	(1,911)
Net decrease in cash and cash equivalents	(25,551)	(17,406)
Cash and cash equivalents, beginning of period	244,979	238,605
Cash and cash equivalents, end of period	219,428	221,199
Supplemental disclosure of non-cash investing and financing activities
Property and equipment additions included in accounts payable and accrued expenses	23	74
Tax related to net settlement of equity awards included in accounts payable and accrued expenses	$ 32	$ 0