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Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues $ 6,324 $ 4,505 $ 13,164 $ 9,939
Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenues 6,300 4,100 13,100 9,400
Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenues $ 45 $ 384 $ 54 $ 571