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BALANCE SHEET COMPONENTS (Tables)
 12 Months Ended
Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of accounts receivable, net and activity in allowance for uncollectible accounts
Accounts receivable, net consisted of the following (in thousands):
As of December 31,
20252024
Accounts receivable$219 $339 
Allowance for uncollectible accounts(18)(4)
Accounts receivable, net$201 $335 
The following is the activity in the allowance for uncollectible accounts (in thousands):
Years Ended December 31,
20252024
Balance as of beginning of year$4 $4 
Increase in provision14 — 
Amounts written off, less recoveries— — 
Balance as of end of year$18 $4 
Schedule of inventory, net and activity in reserve for obsolescence
Inventory consisted of the following (in thousands):
As of December 31,
20252024
Raw materials$726 $719 
Work in progress— 1 
Finished goods268 74 
Total inventory994 794 
Reserve for obsolescence— — 
Inventory$994 $794 
The following is the activity in the reserve for obsolescence (in thousands):
Years Ended December 31,
20252024
Balance as of beginning of year$— $5 
Increase in reserve— — 
Amounts relieved— (5)
Balance as of end of year$— $— 
Schedule of prepaid expenses
Prepaid expenses and other current assets consisted of the following (in thousands):
As of December 31,
20252024
Software licenses$127 $112 
Insurance47 27 
Rent32 38 
Equity offering costs29 146 
Marketing programs and conferences25 21 
Professional services14 18 
Other23 15 
Total prepaid and other current expenses$297 $377 
Schedule of property and equipment, net
Depreciation on property and equipment is computed using the straight-line method over the estimated useful lives of the respective assets as follows:
Research and development equipment5 years
Office and computer equipment3 years
Autos5 years
Furniture and fixtures7 years
Property and equipment, net consisted of the following (in thousands):
As of December 31,
20252024
Research and development equipment$1,291 $1,826 
Office and computer equipment84 494 
Autos54 54 
Furniture and fixtures47 46 
Leasehold improvements105 157 
Total in service1,581 2,577 
Accumulated depreciation and amortization(1,171)(2,242)
Total in service, net410 335 
Construction in progress— 72 
Property and equipment, net$410 $407 
Schedule of accrued expenses
Accrued expenses consisted of the following (in thousands):
As of December 31,
20252024
Compensation and related benefits$313 $244 
Legal and other services66 30 
Product warranty and other4 4 
Total accrued expenses$383 $278 
Schedule of maturities of notes payable
As of December 31, 2025, the future principal payments were as follows (in thousands):
2026$61 
202768 
202865 
202912 
2030— 
Total principal payments206 
Less: current portion of notes payable(61)
Notes payable, less current portion$145