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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Other Liabilities and Financial Instruments Subject to Mandatory Redemption [Abstract]  
Schedule of other current liabilities
   As of December 31, 
(in thousands)  2020   2019 
Warranty accrual - current portion  $2,806   $1,567 
Long-term debt - current portion   2,004    
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Insurance financing   910    350 
Tax Receivable Agreement liability – current portion   6,545    501 
Other   1,318    1,811 
Total other current liabilities  $13,583   $4,229