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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:        
Net loss $ (21,152) $ (12,509) $ (46,304) $ (42,430)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation     251 214
Stock-based compensation     9,339 7,679
Loss on disposal of property and equipment     4 3
Changes in operating assets and liabilities:        
Prepaid expenses and other assets     (3,910) (5,945)
Accounts payable, accrued expenses and other liabilities (including related party amounts of $0 and $15, respectively)     4,293 2,150
Right-of-use assets and lease liabilities, net     (280) 24
Net cash used in operating activities     (36,607) (38,305)
Cash flows from investing activities:        
Purchases of property and equipment     (167) (538)
Net cash used in investing activities     (167) (538)
Cash flows from financing activities:        
Proceeds from issuances of common stock under benefit plans     1,213 629
Net cash provided by financing activities     1,213 629
Net cash decrease for the period     (35,561) (38,214)
Cash, cash equivalents and restricted cash at beginning of the period     252,213 302,425
Cash, cash equivalents and restricted cash at end of the period 216,652 264,211 216,652 264,211
Reconciliation of cash, cash equivalents and restricted cash to the balance sheet        
Cash and cash equivalents 215,652 263,211 215,652 263,211
Restricted cash 1,000 1,000 1,000 1,000
Total cash, cash equivalents and restricted cash $ 216,652 $ 264,211 216,652 264,211
Supplemental disclosure of cash flow information:        
Right-of-use asset obtained in exchange for lease liability     4,004 1,556
Non-cash investing and financing activities:        
Purchases of equipment included in accounts payable and accrued expenses     146 9
Vesting of options early exercised subject to repurchase     $ 93 $ 142