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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (37,518) $ (19,896)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 451 496
Stock-based compensation expense 5,957 1,908
Loss on fixed asset disposals 3  
Amortization of premium on investments, net 870  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 307 (1,746)
Accounts payable and accrued other liabilities (1,185) 1,375
Net cash used in operating activities (31,115) (17,863)
Cash flows from investing activities:    
Acquisitions of property and equipment (317) (206)
Purchases of investments (25,171)  
Sales and maturities of investments 148,500  
Proceeds from notes receivable   193
Net cash provided by (used in) investing activities 123,012 (13)
Cash flows from financing activities:    
Proceeds from issuance of common stock   138,000
Issuance costs associated with financings (339) (12,692)
Proceeds from stock option exercises 74 51
Net cash (used in) provided by financing activities (265) 125,359
Net increase in cash and cash equivalents 91,632 107,483
Cash and cash equivalents, beginning of period 78,446 89,159
Cash and cash equivalents, end of period 170,078 196,642
Supplemental disclosure of non-cash investing and financing activities:    
Amounts accrued for purchase of property and equipment $ 28 27
Conversion of preferred stock to common stock   $ 178,058