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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (31,450) $ (24,105)
Adjustments to reconcile net loss to net cash used in operating activities:    
Net accretion of discount on investment securities (966) (172)
Noncash lease expense on operating leases 1,293 1,129
Depreciation and amortization 11,864 9,361
Stock-based compensation 10,712 8,181
(Gain) loss on disposal of assets and other adjustments (1) 10
Changes in operating assets and liabilities:    
Accounts receivable 30 (82)
Prepaid expenses and other current assets 941 (211)
Other assets 134 (49)
Accounts payable (245) (757)
Accrued expenses and other current liabilities (1,600) (858)
Deferred revenue 259 519
Operating lease liabilities (1,399) (1,089)
Other long-term liabilities 0 (69)
Net cash used in operating activities (10,428) (8,192)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (9,734) (92,667)
Maturities of marketable securities 38,500 12,000
Proceeds from disposal of property and equipment 78 0
Purchases of property and equipment, net (4,719) (1,501)
Capitalized internal-use software costs (7,098) (2,838)
Net cash provided by (used in) investing activities 17,027 (85,006)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance leases and lease financing obligations (9,734) (7,212)
Payments of deferred offering costs 0 (658)
Proceeds from debt facility 3,529 0
Principal payments on insurance premium financing (1,024) 0
Employee payroll taxes paid related to net settlement of equity awards 0 (130)
Proceeds from exercises of stock options 2,182 2,063
Proceeds from ESPP 1,171 1,529
Net cash used in financing activities (3,876) (4,408)
Net increase (decrease) in cash, restricted cash and restricted cash, non-current 2,723 (97,606)
Cash and restricted cash at beginning of period 11,165 105,012
Cash, restricted cash and restricted cash, non-current at end of period 13,888 7,406
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 1,816 1,888
Cash paid for income taxes 58 26
Cash paid for operating lease liabilities 1,458 1,184
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 2,030 1,005
Accrued bonus settled in restricted stock units 1,848 0
Accrued bonus classified as stock-based compensation 929 1,043
Equipment acquired through finance lease and lease financing obligations 8,705 11,595
Accruals related to purchases of property and equipment 224 698
Lease liabilities arising from right-of-use assets upon adoption of ASC 842 0 5,220
Assets obtained in exchange for operating lease obligations 268 0
Receivable recorded due to stock option exercises pending settlement 29 0
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash 5,886 7,237
Restricted cash - included in prepaid expenses and other current assets 169 0
Restricted cash - included in other assets   169
Restricted cash, non-current 7,833 0
Total cash, restricted cash and restricted cash, non-current $ 13,888 $ 7,406