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Accrued Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2024
Accrued Liabilities |
Schedule of components of accrued liabilities | The components of accrued liabilities are summarized below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2024 |  | 2023 |
Preferred stock dividends payable | ​ | $ | 2,901 | ​ | $ | 2,901 | ​
Accrued compensation and related charges | ​ | ​ | 2,193 | ​ | ​ | 3,707 | ​
Payable in connection with construction in progress | ​ | ​ | 1,478 | ​ | ​ | 7,249 | ​
Advances from customers | ​ | ​ | 1,106 | ​ | ​ | 305 | ​
Other tax payable | ​ | ​ | 527 | ​ | ​ | 493 | ​
Current portion of operating lease liabilities | ​ | ​ | 471 | ​ | ​ | 458 | ​
Accrued professional services | ​ | ​ | 470 | ​ | ​ | 868 | ​
Accrued product warranty | ​ | ​ | 421 | ​ | ​ | 703 | ​
Accrued income taxes | ​ | ​ | 362 | ​ | ​ | — | ​
Other personnel-related costs | ​ | ​ | 276 | ​ | ​ | 286 | ​
Accrual for sales returns | ​ | ​ | 47 | ​ | ​ | 39 | ​
Other accrued liabilities | ​ | ​ | 2,016 | ​ | ​ | 2,010 | ​
​ | ​ | $ | 12,268 | ​ | $ | 19,019 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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