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Details of Certain Financial Statement Components | 6 Months Ended
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Jun. 30, 2021
Details of Certain Financial Statement Components |
Details of Certain Financial Statement Components | Note 2 – Details of Certain Financial Statement Components Inventories, stated at the lower of cost or net realizable value, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Inventories |  | (in thousands)
Raw materials |  | $ | 500 |  | $ | 520
Work-in-process | ​ | ​ | 251 | ​ | ​ | 246
Finished goods | ​ | ​ | 127 | ​ | ​ | 100
Total inventories |  | $ | 878 |  | $ | 866
​ Property, plant and equipment, net, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Property, plant and equipment, net | ​ | (in thousands)
Furniture, machinery and equipment | ​ | $ | 1,680 | ​ | $ | 1,662
Leasehold improvements | ​ |  | 429 | ​ |  | 538
​ | ​ |  | 2,109 | ​ |  | 2,200
Less: accumulated depreciation | ​ |  | (1,686) | ​ |  | (1,793)
Total property, plant and equipment, net | ​ | $ | 423 | ​ | $ | 407
​ Depreciation expense totaled $57 thousand and $59 thousand for the three months ended June 30, 2021 and 2020, respectively, and $111 thousand and $118 thousand for the six months ended June 30, 2021 and 2020, respectively. Intangible assets, net consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Intangible assets, net | ​ | (in thousands)
Patents and trademarks | ​ | $ | 658 | ​ | $ | 658
Less: accumulated amortization | ​ |  | (496) | ​ |  | (463)
Total intangible assets, net | ​ | $ | 162 | ​ | $ | 195
​ Amortization expense totaled $17 thousand and $15 thousand for the three months ended June 30, 2021 and 2020, respectively, and $34 thousand and $28 thousand for the six months ended June 30, 2021 and 2020, respectively. Future amortization expense on existing intangible assets over the next five years is as follows: ​
​ | ​ | ​ | ​
Years ending December 31, |  | (in thousands)
2021 (remainder of year) | ​ | $ | 32
2022 | ​ |  | 54
2023 | ​ |  | 42
2024 | ​ |  | 27
2025 | ​ |  | 7
Thereafter | ​ |  | —
​ | ​ | $ | 162
​ Accrued liabilities consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Accrued liabilities | ​ | (in thousands)
Accrued warranty | ​ | $ | 7 | ​ | $ | 7
Accrued wages and benefits | ​ |  | 165 | ​ |  | 180
Accrued vacation | ​ |  | 79 | ​ |  | 110
Accrued other | ​ |  | 49 | ​ |  | 46
Total accrued liabilities | ​ | $ | 300 | ​ | $ | 343
​

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