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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (48,531,000) $ (59,713,000)
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 64,000 417,000
Noncash lease expense on operating leases 2,727,000 2,350,000
Depreciation and amortization 28,328,000 24,912,000
Impairment loss on right-of-use assets 898,000 0
Stock-based compensation 28,628,000 25,177,000
Impairment of capitalized internal-use software 0 232,000
Gain on disposal of property and equipment (154,000) (292,000)
Other, net 345,000 0
Changes in operating assets and liabilities:    
Accounts receivable (1,031,000) 56,000
Prepaid expenses and other current assets (741,000) (445,000)
Other assets (1,346,000) (389,000)
Accounts payable (547,000) (295,000)
Accrued expenses and other current liabilities 948,000 (1,422,000)
Deferred revenue 5,505,000 4,526,000
Operating lease liabilities (2,588,000) (2,464,000)
Net cash provided by (used in) operating activities 12,505,000 (7,350,000)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of marketable securities (38,097,000) (26,358,000)
Maturities of marketable securities 45,693,000 67,874,000
Proceeds from disposal of property and equipment 455,000 369,000
Purchases of property and equipment (1,711,000) (5,512,000)
Capitalized internal-use software costs (12,471,000) (14,716,000)
Net cash (used in) provided by investing activities (6,131,000) 21,657,000
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on finance lease and lease financing obligations (19,503,000) (19,510,000)
Proceeds from issuance of common stock upon public offering, net of underwriting discounts and commission and other offering costs 37,434,000 0
Payments of offering costs (383,000) 0
Proceeds from debt facility 554,000 4,273,000
Repayment of debt facility (4,682,000) (4,450,000)
Proceeds from insurance premium financing 0 893,000
Principal payments on insurance premium financing (893,000) (1,545,000)
Proceeds from lease financing obligations 0 4,450,000
Proceeds from exercises of stock options 7,477,000 4,708,000
Proceeds from ESPP 2,768,000 2,339,000
Net cash provided by (used in) financing activities 22,772,000 (8,842,000)
Net increase in cash 29,146,000 5,465,000
Cash and cash equivalents and restricted cash, at beginning of period 16,630,000 11,165,000
Cash and cash equivalents, at end of period 45,776,000 16,630,000
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH    
Cash and cash equivalents 45,776,000 12,502,000
Restricted cash, non-current 0 4,128,000
Total cash and cash equivalents and restricted cash, non-current 45,776,000 16,630,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 3,579,000 3,733,000
Cash paid for income taxes 54,000 59,000
Cash paid for operating lease liabilities 4,012,000 2,801,000
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Stock-based compensation included in property and equipment and capitalized internal-use software 3,991,000 4,960,000
Accrued bonus settled in restricted stock units 3,507,000 1,848,000
Bonus plan expense classified as stock-based compensation 2,248,000 3,034,000
Equipment acquired through finance lease and lease financing obligations 17,105,000 13,094,000
Assets obtained in exchange for operating lease obligations $ 9,206,000 $ 5,448,000