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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (11,053) $ (17,113)
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 (21) (540)
Noncash lease expense on operating leases 510 647
Depreciation and amortization 6,912 5,733
Stock-based compensation 5,529 5,828
Loss on disposal of assets 15 0
Changes in operating assets and liabilities:    
Accounts receivable (821) 67
Prepaid expenses and other current assets (568) 474
Other assets (19) 22
Accounts payable (457) (48)
Accrued expenses and other current liabilities 481 (565)
Deferred revenue 3,175 957
Operating lease liabilities (267) (653)
Net cash provided by (used in) operating activities 3,416 (5,191)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (14,778) (9,734)
Maturities of marketable securities 9,758 23,500
Proceeds from disposal of property and equipment (15) 0
Purchases of property and equipment (423) (3,023)
Capitalized internal-use software costs (3,323) (3,434)
Net cash (used in) provided by investing activities (8,781) 7,309
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance leases and lease financing obligations (4,802) (5,112)
Proceeds from debt facility 554 2,996
Principal payments on insurance premium financing (293) (509)
Proceeds from exercises of stock options 4,277 859
Net cash used in financing activities (264) (1,766)
Net (decrease) increase in cash and restricted cash, non-current (5,629) 352
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 11,001 11,517
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 944 918
Cash paid for income taxes 2 2
Cash paid for operating lease liabilities 621 724
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 1,049 1,008
Accrued bonus settled in restricted stock units 3,507 1,848
Equipment acquired through finance lease and lease financing obligations 2,216 3,023
Accruals related to purchases of property and equipment 29 886
Assets obtained in exchange for operating lease obligations 0 183
Receivable recorded due to stock option exercises pending settlement 23 154
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash and cash equivalents 6,319 4,047
Restricted cash - included in prepaid expenses and other current assets   169
Restricted cash, non-current 4,682 7,301
Total cash and restricted cash 11,001 11,517
2023 Employee Bonus Plan    
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Bonus Plan accrual classified as stock-based compensation 473 590
2024 Employee Bonus Plan    
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Bonus Plan accrual classified as stock-based compensation $ 327 $ 0