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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Operating activities    
Net loss $ (69,234) $ (65,581)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 16,007 14,233
Depreciation and amortization 2,022 2,048
Premiums and discounts on available-for-sale marketable securities (2,730) (2,525)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (3,565) 2,776
Contract asset 0 (19,053)
Accounts payable 8,824 3,917
Accrued expenses and other current liabilities (7,209) (11,690)
Deferred revenue (34,365) (2,100)
Operating lease right-of-use assets 615 673
Operating lease liabilities (1,358) (1,154)
Other assets and liabilities 2,153 (694)
Net cash used in operating activities (88,840) (79,150)
Investing activities    
Purchase of property and equipment, net (434) (467)
Purchases of investments (276,266) (83,656)
Maturities of investments 133,860 132,738
Net cash provided by (used in) investing activities (142,840) 48,615
Financing activities    
Proceeds from stock option exercises 19,194 535
Payments on finance leases (425) (277)
Net cash provided by financing activities 18,769 258
Net decrease in cash, cash equivalents and restricted cash (212,911) (30,277)
Cash, cash equivalents and restricted cash at beginning of period 362,811 126,050
Cash, cash equivalents and restricted cash at end of period 149,900 95,773
Supplemental disclosure of cash flow activities    
Cash paid for interest 65 77
Supplemental disclosure of noncash investing and financing activities    
Property and equipment purchases included in accounts payable and accrued expenses 110 357
Cash and cash equivalents 144,090 89,966
Restricted cash 5,810 5,807
Total cash, cash equivalents, and restricted cash $ 149,900 $ 95,773