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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities:    
Net loss $ (52,441) $ (50,115)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 5,032 6,918
Depreciation expense 1,234 1,372
Non-cash interest expense 1,561 864
Non-cash lease expense 579 710
Loss on extinguishment of debt 0 553
Change in fair value of derivative liability (215) (1,715)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (117) 506
Other receivables 0 886
Accounts payable, accrued expenses and other liabilities (3,553) 864
Deferred revenue 0 (1,340)
Operating lease liability (1,348) (1,439)
Net cash used in operating activities (49,268) (41,936)
Investing activities:    
Purchases of property and equipment 0 (131)
Net cash used in investing activities 0 (131)
Financing activities:    
Proceeds from at the market offering of common stock, net of issuance costs 3,621 21,095
Proceeds from drawdown of term loans 0 30,000
Payment of debt issuance costs 0 (673)
Repayment of term loan 0 (40,000)
Proceeds from issuances under Employee Stock Purchase Plan 41 76
Proceeds from stock option exercises 0 35
Net cash provided by financing activities 3,662 10,533
Net decrease in cash, cash equivalents and restricted cash and cash equivalents (45,606) (31,534)
Cash, cash equivalents and restricted cash and cash equivalents—beginning of period 112,215 155,577
Cash, cash equivalents and restricted cash and cash equivalents—end of period 66,609 124,043
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents to the condensed consolidated balance sheets    
Cash and cash equivalents 65,711 122,827
Restricted cash and cash equivalents 898 1,216
Total cash, cash equivalents and restricted cash and cash equivalents 66,609 124,043
Supplemental disclosure of cash flow information:    
Cash paid for interest 2,352 2,577
Supplemental disclosure of non-cash investing and financing activities:    
Purchases of property and equipment in accounts payable and accrued expenses 0 124
Issuance costs in accounts payable and accrued expenses 113 40
Fair value of derivative liability issued with term loan $ 0 $ 4,450