v3.25.4
Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash flows from operating activities    
Net loss $ (21,465) $ (27,141)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 11,089 10,282
Depreciation 238 207
Amortization of debt discount and issuance costs 237 228
Non-cash interest expense 538 954
PIK interest incurred but not paid on term loan 0 1,389
Loss on debt extinguishment 527 0
Amortization of right-of-use asset 1,710 1,562
Gain on short-term investments (41) (229)
Inventory write-downs 159 251
Loss on disposal of property and equipment 14 0
Changes in operating assets and liabilities:    
Accounts receivable (1,830) (536)
Inventory (3,673) (2,418)
Prepaid expenses and other assets 943 384
Accounts payable (730) 671
Accrued liabilities 3,552 (1,392)
Deferred revenue (414) (534)
Operating lease liabilities (1,860) (1,627)
Net cash used in operating activities (11,006) (17,949)
Cash flows from investing activities    
Acquisition of property and equipment (332) (306)
Proceeds from sale of short-term investments 0 9,300
Net cash (used in) provided by investing activities (332) 8,994
Cash flows from financing activities    
Repurchase of common stock from KCK Ltd. (49,546) 0
Proceeds from issuance of common stock under employee plans 1,875 1,931
Taxes withheld and paid related to net share settlement of equity awards (543) (881)
Net cash provided by financing activities 19,600 4,327
Net increase (decrease) in cash and cash equivalents 8,262 (4,628)
Cash, cash equivalents and restricted cash at the Beginning of Period 13,552 18,180
Cash, cash equivalents and restricted cash at the End of Period 21,814 13,552
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 21,692 13,430
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 21,814 13,552
Supplemental disclosure of cash flow information:    
Cash paid for interest 6,196 6,226
Supplemental disclosures of non-cash investing and financing information:    
Deferred offering costs offset against additional paid-in capital 277 110
Purchase of property and equipment included in accounts payable 13 19
Net change in accrued liabilities from early exercise of options 0 (1)
Follow-on Offering    
Cash flows from financing activities    
Proceeds from issuance of common stock in follow-on offering, net of underwriting discounts and commissions 69,654 0
At-the-Market Equity Offering    
Cash flows from financing activities    
Proceeds from issuance of common stock in follow-on offering, net of underwriting discounts and commissions   3,400
Proceeds from At-the-Market offering, net of sales commission 232 3,277
Proceeds from debt, net of discounts and issuance costs 58,435 0
Repayment of debt $ (60,507) $ 0