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Accrued Liabilities (Tables)
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued liabilities

Accrued liabilities consisted of the following at March 31, 2021 and December 31, 2020 (in thousands):

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March 31, 2021

    

December 31, 2020

Accrued salaries, benefits and bonus

​

$

21,880

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$

36,892

Accrued professional, consulting and lobbying fees

​

 

1,318

​

 

3,055

Accrued warranty expense

​

 

944

​

 

769

Accrued income and other taxes

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2,482

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3,848

Accrued inventory in transit

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​

4,696

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​

4,597

Other accrued expenses

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9,777

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10,682

Accrued liabilities

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$

41,097

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$

59,843