Unaudited Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net loss	$ (17,459)	$ (13,410)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	453	81
Stock-based compensation	5,473	3,958
Accretion of discounts on investments, net	(1,678)	(24)
Changes in operating assets and liabilities:
Accounts receivable	(750)	0
Prepaid expenses and other current assets	1,649	(1,400)
Other long-term assets	(221)	55
Accounts payable	(107)	(740)
Accrued expenses	(560)	1,158
Deferred revenue	(1,298)	(1,214)
Operating lease right-of-use assets and liabilities, net	587	14
Net cash used in operating activities	(13,911)	(11,522)
Cash flows from investing activities
Purchases of property and equipment	(285)	(971)
Purchases of short-term investments	(71,705)	(45,061)
Maturities of short-term investments	63,250	77,100
Net cash provided by (used in) investing activities	(8,740)	31,068
Cash flows from financing activities
Proceeds from exercise of vested and unvested common stock options and employee stock purchase plan	1,580	1
Net cash provided by financing activities	1,580	1
Net increase (decrease) in cash, cash equivalents and restricted cash	(21,071)	19,547
Cash, cash equivalents and restricted cash -- beginning of period	52,242	36,398
Cash, cash equivalents and restricted cash -- end of period	31,171	55,945
Supplemental disclosure of noncash investing and financing activities
Unpaid property and equipment	395	396
Vesting of restricted common stock	134	503
Unrealized gain (loss) on available-for-sale securities, net	$ 796	$ (1,297)