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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (59,713) $ (51,398)
Adjustments to reconcile net loss to net cash used in operating activities:    
Net accretion of discount on investment securities and net realized investment gains 417 (863)
Noncash lease expense on operating leases 2,350 2,457
Depreciation and amortization 24,912 20,151
Stock-based compensation 25,177 17,049
Impairment of capitalized internal-use software 232 0
(Gain) loss on disposal of assets (292) 37
Changes in operating assets and liabilities:    
Accounts receivable 56 (547)
Prepaid expenses and other current assets (445) (379)
Other assets (389) 1,001
Accounts payable (295) 1,627
Accrued expenses and other current liabilities (1,422) (970)
Deferred revenue 4,526 670
Operating lease liabilities (2,464) (2,547)
Other long-term liabilities 0 (69)
Net cash used in operating activities (7,350) (13,781)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (26,358) (145,871)
Maturities of marketable securities 67,874 88,000
Proceeds from disposal of property and equipment 369 0
Purchases of property and equipment (5,512) (7,349)
Capitalized internal-use software costs (14,716) (8,634)
Net cash provided by (used in) investing activities 21,657 (73,854)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance lease and lease financing obligations (19,510) (16,492)
Payments of deferred offering costs 0 (658)
Proceeds from debt facility 4,273 4,305
Repayment of debt facility (4,450) 0
Proceeds from insurance premium financing 893 0
Principal payments on insurance premium financing (1,545) 0
Proceeds from lease financing obligations 4,450 0
Employee payroll taxes paid related to net settlement of equity awards 0 (130)
Proceeds from exercises of stock options 4,708 4,252
Proceeds from ESPP 2,339 2,511
Net cash used in financing activities (8,842) (6,212)
Net increase (decrease) in cash, restricted cash and restricted cash, non-current 5,465 (93,847)
Cash, restricted cash, current and restricted cash, non-current at beginning of period 11,165 105,012
Cash, restricted cash, current and restricted cash, non-current at end of period 16,630 11,165
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 3,733 3,776
Cash paid for income taxes 59 31
Cash paid for operating lease liabilities 2,801 2,838
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 4,960 2,674
Accrued bonus settled in restricted stock units 1,848 0
Accrued bonus classified as stock-based compensation 3,034 1,852
Financed insurance premiums included in accrued expenses and other current liabilities 0 1,545
Equipment acquired through finance lease and lease financing obligations 13,094 17,037
Accruals related to purchases of property and equipment 60 158
Lease liabilities arising from right-of-use assets upon adoption of ASC 842 0 5,220
Assets obtained in exchange for operating lease obligations 5,448 4,118
Receivable recorded due to stock option exercises pending settlement 18 156
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash and cash equivalents 12,502 6,690
Restricted cash – included in prepaid expenses and other current assets   169
Restricted cash, non-current 4,128 4,306
Total cash, cash equivalents, restricted cash, current and restricted cash, non-current $ 16,630 $ 11,165