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Details of Certain Financial Statement Components (Tables) | 6 Months Ended
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Jun. 30, 2022
Details of Certain Financial Statement Components |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Inventories |  | (in thousands)
Raw materials |  | $ | 672 |  | $ | 447
Work-in-process | ​ | ​ | 164 | ​ | ​ | 209
Finished goods | ​ | ​ | 172 | ​ | ​ | 159
Total inventories |  | $ | 1,008 |  | $ | 814
Schedule of property, plant and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Property, plant and equipment, net | ​ | (in thousands)
Furniture, machinery and equipment | ​ | $ | 1,678 | ​ | $ | 1,696
Leasehold improvements | ​ |  | 428 | ​ |  | 444
​ | ​ |  | 2,106 | ​ |  | 2,140
Less: accumulated depreciation | ​ |  | (1,861) | ​ |  | (1,802)
Total property, plant and equipment, net | ​ | $ | 245 | ​ | $ | 338
Schedule of intangible assets, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Intangible assets, net | ​ | (in thousands)
Patents and trademarks | ​ | $ | 658 | ​ | $ | 658
Less: accumulated amortization | ​ |  | (556) | ​ |  | (527)
Total intangible assets, net | ​ | $ | 102 | ​ | $ | 131
Schedule of future amortization on existing intangibles | ​
​ | ​ | ​ | ​
Years ending December 31, |  | (in thousands)
2022 (remainder of year) | ​ | $ | 26
2023 | ​ |  | 42
2024 | ​ |  | 27
2025 | ​ |  | 7
​ | ​ | $ | 102
Schedule of accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Accrued liabilities | ​ | (in thousands)
Accrued compensation and benefits | ​ | $ | 172 | ​ | $ | 402
Accrued vacation | ​ |  | 94 | ​ |  | 82
Other accrued liabilities | ​ |  | 23 | ​ |  | 23
Total accrued liabilities | ​ | $ | 289 | ​ | $ | 507

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