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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (43,363) $ (11,746)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 393 277
Amortization of debt issuance costs 2 25
Stock-based compensation 9,015 175
Non-cash lease expense 565 527
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 749 (261)
Accounts payable and accrued expenses 6,789 (1,639)
Lease liability (486) (429)
Net cash used in operating activities (26,336) (13,071)
Cash flows from investing activities:    
Purchase of property and equipment (735) (38)
Net cash used in investing activities (735) (38)
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 0 33,707
Principal payments on term loan payable (846) (467)
Proceeds from exercise of common stock options and employee stock purchase plan 1,037 8
Net cash provided by financing activities 191 33,248
Change in cash, cash equivalents, and restricted cash (26,880) 20,139
Cash, cash equivalents, and restricted cash at beginning of period 386,919 10,526
Cash, cash equivalents, and restricted cash at end of period 360,039 30,665
Supplemental disclosure of cash flow information:    
Proceeds for the issuance of redeemable preferred stock on July 1, 2020 included in proceeds from issuance of redeemable preferred stock, net of issuance costs 0 12,048
Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes $ 0 $ 10,095