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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (13,337) $ (9,206)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,832 202
Depreciation and amortization expense 172 88
(Accretion) amortization on marketable securities (3) 37
Change in deferred taxes and uncertain tax positions 16 130
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (1,254) 419
Other assets 6 (87)
Accounts payable 2,208 (245)
Accrued expenses and other current liabilities (3,944) 1,331
Deferred rent (12) 44
Net cash used in operating activities (14,316) (7,287)
Cash flows from investing activities:    
Purchase of property and equipment (24) (430)
Purchase of investments (96,792) (715)
Proceeds from sales and maturities of investments   7,992
Net cash (used in) provided by investing activities (96,816) 6,847
Cash flows from financing activities:    
Net proceeds from initial public offering 136,362  
Proceeds from notes receivable 12,718  
Payment of loans payable (12,880)  
Payment of deferred offering costs (1,031) (33)
Net cash provided by (used in) financing activities 135,169 (33)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (62) (158)
Net increase (decrease) in cash, cash equivalents and restricted cash 23,975 (631)
Cash, cash equivalents and restricted cash at beginning of period 74,854 12,375
Cash, cash equivalents and restricted cash at end of period 98,829 $ 11,744
Supplemental disclosure of noncash investing and financing activities:    
Conversion of preferred stock to common stock upon closing of the initial public offering 186,033  
Deferred offering costs within accounts payable and accrued expenses $ 825