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ACCRUED LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
ACCRUED LIABILITIES. |
Schedule of accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of March 31, |  | As of December 31,
​ | ​ | 2021 | ​ | 2020
Warranty liability | ​ | $ | 2,346 | ​ | $ | 2,594
Litigation reserve | ​ |  | 562 | ​ |  | 899
Federal and state taxes payable | ​ |  | 4,563 | ​ |  | 5,603
Accrued expenses & other accrued liabilities | ​ |  | 6,206 | ​ |  | 5,764
Total | ​ | $ | 13,677 | ​ | $ | 14,860

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