Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Disaggregation of revenue (Details)

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REVENUE - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of revenue    
Revenue $ 69,559 $ 60,851
Variable consideration    
Maximum limited warranty term 2 years  
U.S.    
Disaggregation of revenue    
Revenue $ 64,057 51,190
Canada    
Disaggregation of revenue    
Revenue 5,502 9,661
Cost-plus reimbursement contracts    
Disaggregation of revenue    
Revenue 54,255 55,593
Fixed-price contracts    
Disaggregation of revenue    
Revenue $ 15,304 $ 5,258