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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (17,113) $ (12,530)
Adjustments to reconcile net loss to net cash used in operating activities:    
Net accretion of discount on investment securities (540) (61)
Noncash lease expense on operating leases 647 541
Depreciation and amortization 5,733 4,863
Stock-based compensation 5,828 3,835
Loss (gain) on disposal of assets and other adjustments 0 (1)
Changes in operating assets and liabilities:    
Accounts receivable 67 68
Prepaid expenses and other current assets 474 (153)
Other assets 22 91
Accounts payable (48) 462
Accrued expenses and other current liabilities (565) 1,633
Deferred revenue 957 912
Operating lease liabilities (653) (528)
Other long-term liabilities 0 (32)
Net cash used in operating activities (5,191) (900)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (9,734) (79,782)
Maturities of marketable securities 23,500 0
Purchases of property and equipment, net (3,023) (515)
Capitalized internal-use software costs (3,434) (1,180)
Net cash provided by (used in) investing activities 7,309 (81,477)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance leases and lease financing obligations (5,112) (3,405)
Payments of deferred offering costs 0 (658)
Proceeds from debt facility 2,996 0
Principal payments on insurance premium financing (509) 0
Proceeds from exercises of stock options 859 887
Net cash used in financing activities (1,766) (3,176)
Net increase (decrease) in cash, restricted cash and restricted cash, non-current 352 (85,553)
Cash and restricted cash at beginning of period 11,165 105,012
Cash, restricted cash and restricted cash, non-current at end of period 11,517 19,459
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 918 948
Cash paid for income taxes 2 26
Cash paid for operating lease liabilities 724 598
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in capitalized internal-use software 1,008 383
Accrued bonus settled in restricted stock units 1,848 0
Accrued bonus classified as stock-based compensation 590 493
Equipment acquired through finance lease and lease financing obligations 3,023 4,451
Accruals related to purchases of property and equipment 886 124
Lease liabilities arising from right-of-use assets upon adoption of ASC 842 0 5,220
Assets obtained in exchange for operating lease obligations 183 0
Receivable recorded due to stock option exercises pending settlement 154 0
RECONCILIATION OF CASH AND RESTRICTED CASH    
Cash and cash equivalents 4,047 19,290
Restricted cash - included in prepaid expenses and other current assets 169 169
Restricted cash, non-current 7,301 0
Total cash, restricted cash and restricted cash, non-current $ 11,517 $ 19,459