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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (21,401) $ (31,450)
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 31 (966)
Noncash lease expense on operating leases 1,018 1,293
Depreciation and amortization 13,937 11,864
Stock-based compensation 11,057 10,712
Gain on disposal of assets and other (6) (1)
Changes in operating assets and liabilities:    
Accounts receivable (1,014) 30
Prepaid expenses and other current assets (59) 941
Other assets (104) 134
Accounts payable (745) (245)
Accrued expenses and other current liabilities (274) (1,600)
Deferred revenue 3,994 259
Operating lease liabilities (791) (1,399)
Net cash provided by (used in) operating activities 5,643 (10,428)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (24,127) (9,734)
Maturities of marketable securities 26,523 38,500
Proceeds from disposal of property and equipment 184 78
Purchases of property and equipment (694) (4,719)
Capitalized internal-use software costs (6,828) (7,098)
Net cash (used in) provided by investing activities (4,942) 17,027
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance leases and lease financing obligations (9,711) (9,734)
Proceeds from debt facility 554 3,529
Principal payments on insurance premium financing (590) (1,024)
Proceeds from exercises of stock options 5,012 2,182
Proceeds from ESPP 1,359 1,171
Net cash used in financing activities (3,376) (3,876)
Net (decrease) increase in cash and restricted cash, non-current (2,675) 2,723
Cash, cash equivalents, restricted cash, current and restricted cash, non-current at beginning of period 16,630 11,165
Cash, restricted cash, current and restricted cash, non-current at end of period 13,955 13,888
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 1,817 1,816
Cash paid for income taxes 42 58
Cash paid for operating lease liabilities 1,328 1,458
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 1,965 2,030
Accrued bonus settled in restricted stock units 3,507 1,848
Equipment acquired through finance lease and lease financing obligations 5,989 8,705
Accruals related to purchases of property and equipment 18 224
Assets obtained in exchange for operating lease obligations 0 268
Receivable recorded due to stock option exercises pending settlement 5 29
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash and cash equivalents 9,273 5,886
Restricted cash - included in prepaid expenses and other current assets   169
Restricted cash, non-current 4,682 7,833
Total cash and restricted cash 13,955 13,888
2023 Employee Bonus Plan    
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Bonus Plan accrual classified as stock-based compensation 473 929
2024 Employee Bonus Plan    
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Bonus Plan accrual classified as stock-based compensation $ 853 $ 0