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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (34,154) $ (47,505)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Net accretion of discount on investment securities and net realized investment gains (33) 113
Noncash lease expense on operating leases 1,708 1,839
Depreciation and amortization 21,268 18,337
Stock-based compensation 19,495 18,670
Gain on disposal of assets (289) (242)
Other 314 0
Changes in operating assets and liabilities:    
Accounts receivable (1,962) (1,135)
Prepaid expenses and other current assets (140) 867
Other assets (423) (313)
Accounts payable (383) (592)
Accrued expenses and other current liabilities 837 (366)
Deferred revenue 5,300 1,697
Operating lease liabilities (1,266) (1,968)
Net cash provided by (used in) operating activities 10,272 (10,598)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (32,501) (19,492)
Maturities of marketable securities 31,402 57,380
Proceeds from disposal of property and equipment 337 319
Purchases of property and equipment (885) (5,066)
Capitalized internal-use software costs (10,235) (11,061)
Net cash (used in) provided by investing activities (11,882) 22,080
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance leases and lease financing obligations (14,755) (14,878)
Proceeds from debt facility 554 4,273
Repayment of debt facility 0 (2,500)
Principal payments on insurance premium financing (893) (1,545)
Proceeds from lease financing obligations 0 2,500
Proceeds from exercises of stock options 6,347 3,426
Proceeds from ESPP 1,359 1,171
Net cash used in financing activities (7,388) (7,553)
Net (decrease) increase in cash and restricted cash, non-current (8,998) 3,929
Cash and cash equivalents and restricted cash, at beginning of period 16,630 11,165
Cash and cash equivalents and restricted cash, at end of period 7,632 15,094
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash and cash equivalents 2,950 9,016
Restricted cash, current   6,078
Restricted cash, non-current 4,682 0
Total cash and cash equivalents and restricted cash 7,632 15,094
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 2,692 2,752
Cash paid for income taxes 54 58
Cash paid for operating lease liabilities 2,041 2,174
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 3,162 3,703
Accrued bonus settled in restricted stock units 3,507 1,848
Bonus Plan accrual classified as stock-based compensation 1,812 2,586
Equipment acquired through finance lease and lease financing obligations 11,355 11,995
Accruals related to purchases of property and equipment 94 131
Assets obtained in exchange for operating lease obligations $ 7,457 $ 5,568