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Details of Certain Financial Statement Components (Tables) | 12 Months Ended
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Dec. 31, 2021
Details of Certain Financial Statement Components |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Inventories |  | (in thousands)
Raw materials |  | $ | 447 |  | $ | 520
Work-in-process | ​ | ​ | 209 | ​ | ​ | 246
Finished goods | ​ | ​ | 158 | ​ | ​ | 100
Total inventories |  | $ | 814 |  | $ | 866
Schedule of property, plant and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Property, plant and equipment, net | ​ | (in thousands)
Furniture, machinery and equipment |  | $ | 1,696 |  | $ | 1,662
Leasehold improvements | ​ |  | 444 | ​ |  | 538
​ | ​ |  | 2,140 | ​ |  | 2,200
Less: accumulated depreciation | ​ |  | (1,802) | ​ |  | (1,793)
Total property, plant and equipment, net | ​ | $ | 338 | ​ | $ | 407
Schedule of intangible assets, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Intangible assets, net | ​ | (in thousands)
Patents and trademarks |  | $ | 658 |  | $ | 658
Less: accumulated amortization | ​ |  | (527) | ​ |  | (463)
Total intangibles, net | ​ | $ | 131 | ​ | $ | 195
Schedule of future amortization on existing intangibles | ​
​ | ​ | ​ | ​
Years ending December 31, |  | (in thousands)
2022 | ​ | $ | 55
2023 | ​ |  | 42
2024 | ​ |  | 27
2025 | ​ |  | 7
2026 | ​ | ​ | —
Thereafter | ​ |  | —
​ | ​ | $ | 131
Schedule of accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Accrued liabilities | ​ | (in thousands)
Accrued warranty |  | $ | 3 |  | $ | 7
Accrued wages and benefits | ​ |  | 402 | ​ |  | 180
Accrued vacation | ​ |  | 82 | ​ |  | 110
Accrued other | ​ |  | 20 | ​ |  | 20
Total accrued liabilities | ​ | $ | 507 | ​ | $ | 343

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