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Details of Certain Financial Statement Components (Tables) | 3 Months Ended
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Mar. 31, 2022
Details of Certain Financial Statement Components |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2022 |  | 2021
Inventories |  | (in thousands)
Raw materials |  | $ | 459 |  | $ | 447
Work-in-process | ​ | ​ | 201 | ​ | ​ | 209
Finished goods | ​ | ​ | 139 | ​ | ​ | 159
Total inventories |  | $ | 799 |  | $ | 814
Schedule of property, plant and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2022 |  | 2021
Property, plant and equipment, net | ​ | (in thousands)
Furniture, machinery and equipment | ​ | $ | 1,702 | ​ | $ | 1,696
Leasehold improvements | ​ |  | 445 | ​ |  | 444
​ | ​ |  | 2,147 | ​ |  | 2,140
Less: accumulated depreciation | ​ |  | (1,857) | ​ |  | (1,802)
Total property, plant and equipment, net | ​ | $ | 290 | ​ | $ | 338
Schedule of intangible assets, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2022 |  | 2021
Intangible assets, net | ​ | (in thousands)
Patents and trademarks | ​ | $ | 658 | ​ | $ | 658
Less: accumulated amortization | ​ |  | (542) | ​ |  | (527)
Total intangible assets, net | ​ | $ | 116 | ​ | $ | 131
Schedule of future amortization on existing intangibles | ​
​ | ​ | ​ | ​
Years ending December 31, |  | (in thousands)
2022 (remainder of year) | ​ | $ | 40
2023 | ​ |  | 42
2024 | ​ |  | 27
2025 | ​ |  | 7
​ | ​ | $ | 116
Schedule of accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2022 |  | 2021
Accrued Liabilities | ​ | (in thousands)
Accrued wages and benefits | ​ | $ | 113 | ​ | $ | 402
Accrued vacation | ​ |  | 96 | ​ |  | 82
Other accrued liabilities | ​ |  | 24 | ​ |  | 23
Total accrued liabilities | ​ | $ | 251 | ​ | $ | 507

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