Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (120,227)	$ (88,261)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	1,377	1,368
Stock-based compensation expense	35,331	11,743
Non-cash operating lease expense	1,833	1,260
Accretion on short-term investments	(10,215)	(264)
Changes in operating assets and liabilities:
Accounts receivable	1,983	516
Prepaid expenses and other current assets	(3,583)	2,605
Other non-current assets	367	441
Accounts payable	1,797	254
Accrued liabilities	2,082	8,315
Operating lease liabilities	(2,004)	(1,369)
Net cash used in operating activities	(91,259)	(63,392)
Cash flows from investing activities
Purchase of short-term investments	(525,572)	(289,402)
Maturity of short-term investments	367,499	120,770
Purchase of property and equipment	(860)	(1,594)
Net cash used in investing activities	(158,933)	(170,226)
Cash flows from financing activities
Proceeds from issuances of common stock under benefit plans	4,769	1,305
Payment of offering costs	(834)	(786)
Payment of debt issuance costs	0	(150)
Proceeds from term loan	0	10,000
Proceeds from sale of common stock in a public offering	270,251	216,201
Net cash provided by financing activities	274,186	226,570
Net increase (decrease) in cash and cash equivalents	23,994	(7,048)
Cash and cash equivalents at beginning of period	33,685	51,665
Cash and cash equivalents at end of period	57,679	44,617
Supplemental disclosures of cash flow information:
Cash paid for interest	864	332
Supplemental disclosures of noncash investing and financing activities:
Net unrealized loss on short-term investments	51	2,253
Purchase of property and equipment in accounts payable	0	33
Offering costs in accounts payable	0	14
Right-of-use assets obtained in exchange for new operating lease liabilities	0	950
Decrease in right-of -use assets and liabilities from lease modifications	$ 1,821	$ 0