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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net loss $ (102,809) $ (78,740)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 1,135 929
Stock-based compensation expense 20,310 24,969
Non-cash operating lease expense 1,831 1,236
Net amortization (accretion) on short-term investments and debt 944 (6,512)
Changes in operating assets and liabilities:    
Accounts receivable 0 403
Prepaid expenses and other current assets 313 (1,809)
Other non-current assets (45) 0
Accounts payable (1,369) 738
Accrued liabilities 4,767 5,087
Operating lease liabilities (645) (1,336)
Net cash used in operating activities (75,568) (55,035)
Cash flows from investing activities    
Purchase of short-term investments (100,897) (411,096)
Maturity of short-term investments 173,888 214,676
Purchase of property and equipment (2,743) (766)
Net cash provided by (used in) investing activities 70,248 (197,186)
Cash flows from financing activities    
Proceeds from issuances of common stock under benefit plans 2,563 3,995
Proceeds from term loan, net 19,909 0
Payment of offering costs 0 (759)
Proceeds from sale of common stock in a public offering 0 270,251
Net cash provided by financing activities 22,472 273,487
Net increase in cash and cash equivalents 17,152 21,266
Cash and cash equivalents and restricted cash at beginning of period 64,716 33,685
Cash, cash equivalents and restricted cash at end of period 81,868 54,951
Supplemental disclosures of cash flow information:    
Cash paid for interest 1,039 570
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets    
Cash and cash equivalents 80,386 54,951
Restricted cash 1,482 0
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows 81,868 54,951
Supplemental disclosures of noncash investing and financing activities:    
Net unrealized loss on short-term investments (962) (283)
Purchase of property and equipment in accounts payable and accrued liabilities 220 10
Supplemental disclosures of cash flow information related to leases:    
Right-of-use assets obtained in exchange for new operating lease liabilities $ 29,779 $ 0