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Balance Sheet Components | 12 Months Ended
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Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract] |
Balance Sheet Components | BALANCE SHEET COMPONENTS Accounts Receivable, Net Accounts receivable consists of the following:
| December 31,
| 2022 |  | 2021
Accounts receivable, gross | $ | 10,124 |  |  | $ | 8,744 |
Allowance for doubtful accounts | (77) |  |  | (36) |
Accounts receivable, net | $ | 10,047 |  |  | $ | 8,708 |
The following is a summary of the change in our allowance for doubtful accounts:
| Year Ended December 31,
| 2022 |  | 2021 |  |
Balance at beginning of year | $ | 36 |  |  | $ | 41 |  |  |
Additions charged (reductions credited) | 41 |  |  | (5) |  |  |
Balance at end of year | $ | 77 |  |  | $ | 36 |  |  |
Inventories Inventories consist of the following:
| December 31,
| 2022 |  | 2021
Finished goods | $ | 480 |  |  | $ | 461 |
Work-in-process | 1,280 |  |  | 1,008 |
Inventories | $ | 1,760 |  |  | $ | 1,469 |
We recorded inventory write-downs of $99 and $488 for the years ended December 31, 2022 and 2021, respectively. The inventory write-downs were for lower of cost or net realizable value and excess and obsolescence exposure. The inventory write-downs were offset by sales of previously written-down inventory of $17 and $9 for the years ended December 31, 2022 and 2021, respectively. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of current prepaid expenses, deposits, income taxes receivable and other receivables. Property and Equipment, Net Property and equipment consists of the following:
| December 31,
| 2022 |  | 2021
Equipment, furniture and fixtures | $ | 9,637 |  |  | $ | 9,463 |
Tooling | 2,903 |  |  | 5,749 |
Software | 6,739 |  |  | 5,230 |
Leasehold improvements | 1,513 |  |  | 1,375 |
| 20,792 |  |  | 21,817 |
Accumulated depreciation and amortization | (16,160) |  |  | (16,161) |
Property and equipment, net | $ | 4,632 |  |  | $ | 5,656 |
Software amortization was $1,505 and $1,214 for the years ended December 31, 2022 and 2021, respectively. Depreciation and amortization expense for equipment, furniture, fixtures, tooling and leasehold improvements was $2,620 and $2,281 for the years ended December 31, 2022 and 2021, respectively. Other Assets, Net Other assets consist primarily of deposits, deferred tax assets and licensed technology. Amortization of licensed technology was $532 and $153 for the years ended December 31, 2022 and 2021, respectively. Acquired Intangible Assets, Net In connection with the Acquisition, we recorded certain identifiable intangible assets. Acquired intangible assets resulting from this transaction consist of the following:
| December 31,
| 2022 |  | 2021
Developed technology | $ | 5,050 |  |  | $ | 5,050 |
Customer relationships | 1,270 |  |  | 1,270 |
Backlog and tradename | 410 |  |  | 410 |
| 6,730 |  |  | 6,730 |
Less: accumulated amortization | (6,730) |  |  | (6,640) |
Acquired intangible assets, net | $ | — |  |  | $ | 90 |
Developed technology and customer relationships were fully amortized as of March 31, 2022, tradename was fully amortized as of March 31, 2019 and backlog was fully amortized as of September 30, 2018. Amortization expense for intangible assets was $90 for the year ended December 31, 2022, $72 was included in cost of revenue and $18 was included in selling, general and administrative for the year ended December 31, 2022, in the condensed consolidated statements of operations. Goodwill Goodwill resulted from the Acquisition, whereby we recorded goodwill of $18,407. See Note 2: "Summary of Significant Accounting Policies" for information on our assessment of goodwill impairment. Accrued Liabilities and Current Portion of Long-Term Liabilities Accrued liabilities and current portion of long-term liabilities consist of the following:
| December 31,
| 2022 |  | 2021
Accrued payroll and related liabilities | $ | 3,632 |  |  | $ | 3,490 |
Operating lease liability, current | 1,391 |  |  | 2,439 |
Current portion of accrued liabilities for asset financings | 876 |  |  | 1,077 |
Accrued interest payable | 246 |  |  | 361 |
Deferred revenue | 230 |  |  | 50 |
Accrued commissions and royalties | 210 |  |  | 259 |
Liability for warranty returns | 15 |  |  | — |
Deferred research and development reimbursement | — |  |  | 1,838 |
Other | 2,249 |  |  | 4,049 |
Accrued liabilities and current portion of long-term liabilities | $ | 8,849 |  |  | $ | 13,563 |
The following is a summary of the change in deferred revenue:
| Year Ended December 31,
| 2022 |  | 2021 |  |
Deferred revenue: |  |  |  |  |
Balance at beginning of period | $ | 50 |  |  | $ | 179 |  |  |
Revenue recognized | (1,474) |  |  | (1,127) |  |  |
Revenue deferred | 1,654 |  |  | 998 |  |  |
Balance at end of period | $ | 230 |  |  | $ | 50 |  |  |

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