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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (47,505) $ (36,905)
Adjustments to reconcile net loss to net cash used in operating activities:    
Accretion of discount on investment securities and investment income, net 113 (367)
Noncash lease expense on operating leases 1,839 1,820
Depreciation and amortization 18,337 14,689
Stock-based compensation 18,670 13,011
(Gain) loss on disposal of assets and other adjustments (242) 24
Changes in operating assets and liabilities:    
Accounts receivable (1,135) (411)
Prepaid expenses and other current assets 867 (234)
Other assets (313) 56
Accounts payable (592) (137)
Accrued expenses and other current liabilities (366) (901)
Deferred revenue 1,697 635
Operating lease liabilities (1,968) (1,853)
Other long-term liabilities 0 (69)
Net cash used in operating activities (10,598) (10,642)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (19,492) (113,259)
Maturities of marketable securities 57,380 61,000
Proceeds from disposal of property and equipment 319 0
Purchases of property and equipment (5,066) (4,061)
Capitalized internal-use software costs (11,061) (5,645)
Net cash provided by (used in) investing activities 22,080 (61,965)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance leases and lease financing obligations (14,878) (11,602)
Payments of deferred offering costs 0 (658)
Proceeds from debt facility 4,273 2,543
Repayment of debt facility (2,500) 0
Principal payments on insurance premium financing (1,545) 0
Proceeds from lease financing obligations 2,500 0
Employee payroll taxes paid related to net settlement of equity awards 0 (130)
Proceeds from exercises of stock options 3,426 3,439
Proceeds from ESPP 1,171 1,529
Net cash used in financing activities (7,553) (4,879)
Net increase (decrease) in cash, restricted cash and restricted cash, non-current 3,929 (77,486)
Cash, restricted cash, current and restricted cash, non-current at beginning of period 11,165 105,012
Cash, cash equivalents, restricted cash, current and restricted cash, non-current at end of period 15,094 27,526
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 2,752 2,838
Cash paid for income taxes 58 26
Cash paid for operating lease liabilities 2,174 1,948
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 3,703 1,808
Accrued bonus settled in restricted stock units 1,848 0
Accrued bonus classified as stock-based compensation 2,586 1,716
Equipment acquired through finance lease and lease financing obligations 11,995 15,680
Accruals related to purchases of property and equipment 131 337
Lease liabilities arising from right-of-use assets upon adoption of ASC 842 0 5,220
Assets obtained in exchange for operating lease obligations 5,568 0
Receivable recorded due to stock option exercises pending settlement 38 0
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash and cash equivalents 9,016 24,813
Restricted cash - included in prepaid expenses and other current assets   169
Restricted cash, current 6,078 0
Restricted cash, non-current 0 2,544
Total cash, cash equivalents, restricted cash and restricted cash, non-current $ 15,094 $ 27,526