CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (13,723)	$ (7,849)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation expense	311	66
Non-cash lease expense	322
Stock-based compensation	891	112
Changes in operating assets and liabilities:
Operating lease liability	(16)
Prepaid expenses and other current assets	(3,131)	(347)
Accounts payable and accrued expenses	(2,444)	1,933
Other assets	141
Net cash used in operating activities	(17,649)	(6,085)
Cash flow from investing activities
Purchases of property and equipment	(1,171)	(545)
Net cash used in investing activities	(1,171)	(545)
Cash flow from financing activities
Proceeds from issuance of redeemable convertible preferred stock	45,375	17,719
Proceeds from the issuance of common stock upon closing of initial public offering, net of underwriter fees	189,199
Payment of initial public offering costs	(1,744)
Proceeds from stock option exercises	18	43
Net cash provided by financing activities	232,848	17,762
Net increase in cash, cash equivalents and restricted cash	214,028	11,132
Cash, cash equivalents and restricted cash, beginning of period	50,098	8,025
Cash, cash equivalents and restricted cash, end of period	264,126	19,157
Supplemental disclosure of non-cash activities
Conversion of redeemable convertible preferred stock to common stock upon closing of the initial public offering	152,711
Purchases of property and equipment in accounts payable	149	$ 270
Deferred offering costs in accounts payable and accrued expenses	$ 471