v3.25.4
Consolidated statements of cash flows - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash flows from operating activities:    
Net loss $ (47,123,000) $ (46,889,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 3,252,000 3,362,000
Noncash interest expense 97,000 0
Stock-based compensation expense 4,033,000 3,874,000
Provision for excess & obsolete inventory 1,143,000 95,000
Noncash lease expense 1,218,000 1,166,000
Gain on revaluation of warrant liability (131,000) 0
Accretion on investments 351,000 (1,024,000)
Other 34,000 34,000
Changes in operating assets and liabilities    
Accounts receivable 4,387,000 (1,987,000)
Inventory 1,465,000 (335,000)
Prepaid expenses and other current assets 320,000 403,000
Other long-term assets 64,000 (150,000)
Accounts payable 1,600,000 562,000
Accrued expenses and other current liabilities 28,000 (3,890,000)
Other long-term liabilities 64,000 0
Deferred revenue (1,864,000) 626,000
Net cash used in operating activities (31,062,000) (44,153,000)
Cash flows from investing activities:    
Purchases of property and equipment (850,000) (1,365,000)
Purchases of investments (27,076,000) (35,035,000)
Sales of investments 2,505,000 3,957,000
Maturity of investments 39,750,000 69,100,000
Net cash provided by investing activities 14,329,000 36,657,000
Cash flows from financing activities:    
Proceeds from issuance of Class A common stock - stock option exercise 491,000 7,000
Proceeds from issuance of Class A common stock - employee stock purchase plan 162,000 231,000
Proceeds from issuance of debt 20,000,000 0
Payments of debt issuance costs (878,000) 0
Issuance of Class A common stock under the ATM offering 445,000 0
Tax withholding on settlement of restricted stock units (419,000) 0
Payments on finance lease obligations (30,000) (35,000)
Net cash provided by financing activities 19,771,000 203,000
Net increase (decrease) in cash, cash equivalents and restricted cash 3,038,000 (7,293,000)
Cash, cash equivalents and restricted cash at beginning of period 17,276,000 24,569,000
Cash, cash equivalents and restricted cash at end of period 20,314,000 17,276,000
Supplemental disclosure of cash flow information    
Cash paid for interest 770,000 40,000
Supplemental disclosure of non-cash investing activities    
Purchases of property and equipment in accounts payable/accrued expenses 12,000 309,000
Supplemental disclosure of non-cash financing activities    
Recognition of warrant liability in connection with debt issuance 317,000 0
Warrant to purchase Class A common stock $ 317,000 $ 0