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v3.22.1

Accrued Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2022
Accrued Liabilities |
Schedule of components of accrued liabilities | The components of accrued liabilities are summarized below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, | ​
​ |  | 2022 |  | 2021 |
Accrued compensation and related charges | ​ | $ | 3,436 | ​ | $ | 5,115 | ​
Preferred stock dividends payable | ​ | ​ | 2,901 | ​ | ​ | 2,901 | ​
Advances from customers | ​ | ​ | 1,024 | ​ | ​ | 946 | ​
Accrued income taxes | ​ | ​ | 1,001 | ​ | ​ | 539 | ​
Accrued product warranty | ​ | ​ | 832 | ​ | ​ | 743 | ​
Current portion of operating lease liabilities | ​ | ​ | 499 | ​ | ​ | 488 | ​
Accrued professional services | ​ | ​ | 423 | ​ | ​ | 880 | ​
Other personnel-related costs | ​ | ​ | 278 | ​ | ​ | 279 | ​
Payable in connection with construction in progress | ​ | ​ | 268 | ​ | ​ | 2,974 | ​
Other tax payable | ​ | ​ | 230 | ​ | ​ | 392 | ​
Accrual for sales returns | ​ | ​ | 20 | ​ | ​ | 48 | ​
Other accrued liabilities | ​ | ​ | 1,301 | ​ | ​ | 1,752 | ​
​ | ​ | $ | 12,213 | ​ | $ | 17,057 | ​

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