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BALANCE SHEET COMPONENTS
 12 Months Ended
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
BALANCE SHEET COMPONENTS BALANCE SHEET COMPONENTS
Accounts Receivable, Net
Accounts receivable, net consist of the following (in thousands):
As of December 31,
20242023
Accounts receivable$339 $99 
Allowance for uncollectible accounts(4)(4)
Accounts receivable, net$335 $95 
The following is the activity in the allowance for uncollectible accounts (in thousands):
Years Ended December 31,
20242023
Balance as of beginning of year$4 $6 
Increase in provision— 2 
Amounts written off, less recoveries— (4)
Balance as of end of year$4 $4 
Inventory, Net
Inventory, net consist of the following (in thousands):
As of December 31,
20242023
Raw materials$719 $747 
Work in progress1 — 
Finished goods74 53 
Total inventory794 800 
Reserve for obsolescence— (5)
Inventory, net$794 $795 
The following is the activity in the reserve for obsolescence (in thousands):
Years Ended December 31,
20242023
Balance as of beginning of year$5 $18 
Increase in reserve— — 
Amounts relieved(5)(13)
Balance as of end of year$— $5 
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of the following (in thousands):
As of December 31,
20242023
Equity offering costs$146 $— 
Software licenses112 152 
Rent38 — 
Insurance27 64 
Marketing programs and conferences21 1 
Professional services18 30 
Prepaid inventory— 111 
Patents— 14 
Other15 16 
Total prepaid and other current expenses$377 $388 

Property and Equipment, Net
Property and equipment, net consist of the following (in thousands):
As of December 31,
20242023
Research and development equipment$1,826 $1,763 
Office and computer equipment494 808 
Autos54 54 
Furniture and fixtures46 41 
Leasehold improvements157 141 
Total in service2,577 2,807 
Accumulated depreciation and amortization(2,242)(2,419)
Total in service, net335 388 
Construction in progress72 — 
Property and equipment, net$407 $388 

Construction in progress consists of manufacturing equipment. The equipment is expected to be placed in service when we commence operations at our new manufacturing facility, which is expected in April 2025. Also see Note 5.

During the years ended December 31, 2024 and 2023, depreciation and amortization expense was $156,000 and $135,000, respectively.
Accrued Expenses
Accrued expenses consist of the following (in thousands):
As of December 31,
20242023
Compensation and related benefits$244 $232 
Legal and other services30 121 
Product warranty and other4 15 
Total accrued expenses$278 $368 
Notes Payable
We have arranged financing for the purchase of certain equipment. These notes payable have a weighted average annual interest rate of 10.4% with a term of five years and are secured by the underlying equipment.
As of December 31, 2024, the future principal payments were as follows (in thousands):
2025$57 
202661 
202768 
202864 
202912 
Total principal payments262 
Less: current portion of notes payable(56)
Notes payable, less current portion$206