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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |
Accounts Receivable, Net | Accounts receivable consists of the following:
| December 31,
| 2020 |  | 2019
Accounts receivable, gross | $ | 4,713 |  |  | $ | 10,938 |
Allowance for doubtful accounts | (41) |  |  | (23) |
Accounts receivable, net | $ | 4,672 |  |  | $ | 10,915 |
Allowance for Doubtful Accounts | The following is a summary of the change in our allowance for doubtful accounts:
| Year Ended December 31,
| 2020 |  | 2019 |  |
Balance at beginning of year | $ | 23 |  |  | $ | 21 |  |  |
Additions charged | 18 |  |  | 2 |  |  |
Balance at end of year | $ | 41 |  |  | $ | 23 |  |  |
Inventories | Inventories consist of the following:
| December 31,
| 2020 |  | 2019
Finished goods | $ | 1,775 |  |  | $ | 1,630 |
Work-in-process | 670 |  |  | 3,771 |
Inventories | $ | 2,445 |  |  | $ | 5,401 |
Property and Equipment, Net | Property and equipment consists of the following:
| December 31,
| 2020 |  | 2019
Equipment, furniture and fixtures | $ | 8,889 |  |  | $ | 8,494 |
Tooling | 6,298 |  |  | 6,552 |
Software | 5,711 |  |  | 6,428 |
Leasehold improvements | 1,393 |  |  | 1,392 |
| 22,291 |  |  | 22,866 |
Accumulated depreciation and amortization | (17,188) |  |  | (18,258) |
Property and equipment, net | $ | 5,103 |  |  | $ | 4,608 |
Schedule of Finite-Lived Intangible Assets | Acquired intangible assets resulting from this transaction consist of the following:
| December 31,
| 2020 |  | 2019
Developed technology | $ | 5,050 |  |  | $ | 5,050 |
Customer relationships | 1,270 |  |  | 1,270 |
Backlog and tradename | 410 |  |  | 410 |
| 6,730 |  |  | 6,730 |
Less: accumulated amortization | (5,523) |  |  | (4,026) |
Acquired intangible assets, net | $ | 1,207 |  |  | $ | 2,704 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | As of December 31, 2020, future estimated amortization expense is as follows:
Years ending December 31: |
2021 | $ | 1,117 |
2022 | 90 |
| $ | 1,207 |
Accrued Liabilities and Current Portion of Long-Term Liabilities | Accrued liabilities and current portion of long-term liabilities consist of the following:
| December 31,
| 2020 |  | 2019
Accrued payroll and related liabilities | $ | 2,867 |  |  | $ | 3,440 |
Operating lease liability, current | 2,039 |  |  | 1,545 |
Current portion of accrued liabilities for asset financings | 786 |  |  | 483 |
Accrued costs related to restructuring | 630 |  |  | 66 |
Accrued commissions and royalties | 474 |  |  | 663 |
Accrued interest payable | 429 |  |  | 397 |
Deferred revenue | 179 |  |  | 146 |
Other | 2,048 |  |  | 1,952 |
Accrued liabilities and current portion of long-term liabilities | $ | 9,452 |  |  | $ | 8,692 |
Liability for Deferred Revenue | The following is a summary of the change in deferred revenue:
| Year Ended December 31,
| 2020 |  | 2019 |  |
Deferred revenue: |  |  |  |  |
Balance at beginning of period | $ | 146 |  |  | $ | 96 |  |  |
Revenue deferred | 935 |  |  | 511 |  |  |
Revenue recognized | (902) |  |  | (461) |  |  |
Balance at end of period | $ | 179 |  |  | $ | 146 |  |  |

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