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Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenues $ 8,317 $ 6,966
Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenues 8,300 6,800
Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenues $ 9 $ 187