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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract] |
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 |
Allowance for Doubtful Accounts | 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 |
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 |
Schedule of Finite-Lived 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 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense |
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 |
Liability for Deferred Revenue | 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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