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Accrued Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Payables and Accruals [Abstract] |
Schedule of Accrued liabilities | Accrued liabilities consisted of the following at September 30, 2021 and December 31, 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020
Accrued salaries, benefits and bonus | ​ | $ | 59,559 | ​ | $ | 36,892
Accrued professional, consulting and lobbying fees | ​ |  | 5,282 | ​ |  | 3,055
Accrued warranty expense | ​ |  | 1,363 | ​ |  | 769
Accrued income and other taxes | ​ | ​ | 4,459 | ​ | ​ | 3,848
Accrued inventory in transit | ​ |  | 6,316 | ​ |  | 4,597
Other accrued expenses | ​ |  | 11,915 | ​ |  | 10,682
Accrued liabilities | ​ | $ | 88,894 | ​ | $ | 59,843

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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