Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net loss	$ (88,261)	$ (72,732)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	1,368	1,117
Stock-based compensation expense	11,743	7,669
Non-cash operating lease expense	1,260	863
Other	(264)	914
Changes in operating assets and liabilities:
Accounts receivable	516	7,669
Prepaid expenses and other current assets	2,605	(900)
Other non-current assets	441	(380)
Accounts payable	254	401
Accrued liabilities	8,315	719
Other long-term liabilities	0	0
Operating lease liabilities	(1,369)	(918)
Net cash used in operating activities	(63,392)	(55,578)
Cash flows from investing activities
Purchase of short-term investments	(289,402)	(181,967)
Maturity of short-term investments	120,770	231,244
Purchase of property and equipment	(1,594)	(1,361)
Net cash (used in ) provided by investing activities	(170,226)	47,916
Cash flows from financing activities
Proceeds from issuances of common stock	1,305	2,443
Payment of deferred offering costs	(786)	(432)
Payment of debt issuance costs	(150)	0
Proceeds from term loan	10,000	0
Proceeds from sale of common stock in a public offering, net of expenses	216,201	0
Net cash provided by financing activities	226,570	2,011
Net decrease in cash and cash equivalents	(7,048)	(5,651)
Cash and cash equivalents at beginning of period	51,665	50,882
Cash and cash equivalents at end of period	44,617	45,231
Supplemental disclosures of cash flow information:
Cash paid for interest	332	0
Supplemental disclosures of noncash investing and financing activities:
Purchase of property and equipment in accounts payable and accrued liabilities	33	330
Reclassification of restricted stock awards from liabilities to common stock upon vesting	0	7
Deferred offering costs in accounts payable and accrued liabilities	14	17
Net unrealized loss (gain) on short-term investments	2,253	(8)
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 950	$ 0