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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (55,944) $ (45,444)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 668 736
Stock-based compensation expense 9,354 3,589
Non-cash stock consideration, acquisition   12,971
Loss on fixed asset disposals 2  
Amortization of premium on investments, net 1,201 33
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 1,010 (1,599)
Accounts payable and accrued other liabilities 452 2,271
Net cash used in operating activities (43,257) (27,443)
Cash flows from investing activities:    
Acquisitions of property and equipment (550) (256)
Purchases of investments (32,866) (124,640)
Sales and maturities of investments 191,500  
Proceeds from notes receivable   193
Net cash provided by (used in) investing activities 158,084 (124,703)
Cash flows from financing activities:    
Proceeds from issuance of common stock 50,000 138,000
Issuance costs associated with financings (1,852) (12,692)
Payment of deferred offering costs   (394)
Proceeds from stock option exercises 173 104
Net cash provided by financing activities 48,321 125,018
Net increase (decrease) in cash, cash equivalents and restricted cash 163,148 (27,128)
Cash, cash equivalents and restricted cash at beginning of period 78,446 89,159
Cash, cash equivalents and restricted cash at end of period 241,594 62,031
Supplemental disclosure of non-cash investing and financing activities:    
Amounts accrued for purchase of property and equipment $ 42 132
Conversion of preferred stock to common stock   $ 178,058