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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (18,867) $ (5,279)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 186 139
Amortization of debt issuance costs 1 20
Stock-based compensation expense 4,285 47
Non-cash lease expense 280 262
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (54) 92
Accounts payable and accrued expenses 2,208 (2,697)
Lease liability (240) (212)
Net cash used in operating activities (12,201) (7,628)
Cash flows from investing activities:    
Purchase of property and equipment (35) (33)
Net cash used in investing activities (35) (33)
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs   21,659
Principal payments on term loan payable (350) (350)
Proceeds from exercise of common stock options 222 6
Net cash (used in) provided by financing activities (128) 21,315
Change in cash, cash equivalents, and restricted cash (12,364) 13,654
Cash, cash equivalents, and restricted cash at beginning of period 386,919 10,526
Cash, cash equivalents, and restricted cash at end of period 374,555 24,180
Supplemental disclosure of cash flow information:    
Purchases of property and equipment included in accounts payable and accrued expenses 136  
Change in early exercise liability included in accounts payable and accrued expenses $ 32  
Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes   10,095
Unpaid issuance costs and amounts payable to investors for redeemable converteible preferred stock included in accounts payable and accrued liabilities   $ 201