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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net loss $ (37,914) $ (28,008)
Adjustments to reconcile net loss to net cash from operating activities:    
Depreciation 625 581
Noncash operating lease expense 925 877
Stock-based compensation 6,719 4,219
Accretion on marketable securities (1,371) (893)
Other, net (10) 4
Changes in operating assets and liabilities:    
Accounts Receivable   2,000
Prepaid expenses and other current assets 360 (2,783)
Other long-term assets 35 (13)
Accounts payable 1,042 1,552
Accrued expenses and other liabilities (1,609) (6,703)
Operating lease liabilities (188) 26
Deferred revenue (6,471) (5,766)
Net cash used in operating activities (37,857) (34,907)
Cash flows from investing activities    
Purchase of property and equipment (195) (620)
Sales and maturities of marketable securities 109,255 84,705
Purchases of marketable securities (120,263) (52,534)
Net cash (used in) provided by investing activities (11,203) 31,551
Cash flows from financing activities    
Proceeds from at-the-market offerings, net of issuance costs 41,723  
Proceeds from issuance of common stock upon exercise of stock options and purchase of shares under ESPP 1,259 73
Net cash provided by financing activities 42,982 73
Net change in cash, cash equivalents and restricted cash (6,078) (3,283)
Cash, cash equivalents and restricted cash, beginning of period 69,808 63,958
Cash, cash equivalents and restricted cash, end of period 63,730 60,675
Supplemental cash flow information:    
Cash paid for leases 1,351 746
Supplemental disclosure of noncash investing and financing activity:    
Purchases of property and equipment included in accounts payable and accrued expenses 71 290
Revaluation of right-of-use asset and lease liability upon to lease remeasurement $ 497 $ (215)