CONDENSED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (19,373)	$ (8,706)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	3,347	482
Depreciation and amortization	301	141
Accretion and amortization of premium on investments, net	758	(28)
Non-cash lease expense	137	139
Change in fair value of preferred stock purchase right liability		(578)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	825	(163)
Accounts payable and accrued and other liabilities	(642)	426
Net cash used in operating activities	(14,647)	(8,287)
Cash flows from investing activities
Purchases of property and equipment	(1,033)	(2,325)
Purchases of short-term investments	(35,161)	(3,578)
Maturities of short-term investments	16,000	10,800
Net cash provided by (used in) investing activities	(20,194)	4,897
Cash flows from financing activities
Proceeds from stock option exercises	756	1
Proceeds from early exercise of stock options	1	1
Payments of deferred offering costs		(711)
Net cash provided by (used in) financing activities	757	(709)
Net decrease in cash and cash equivalents	(34,084)	(4,099)
Cash, cash equivalents, and restricted cash beginning of period	97,105	20,875
Cash, cash equivalents, and restricted cash end of period	63,021	16,776
Reconciliation of cash, cash equivalents and restricted cash to the balance sheet:
Cash and cash equivalents	62,608	16,507
Restricted cash	413	269
Total cash, cash equivalents and restricted cash	$ 63,021	$ 16,776