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Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue $ 6,464 $ 5,337 $ 13,430 $ 10,219
Transferred over Time        
Disaggregation of Revenue [Line Items]        
Revenue 6,100 5,100 12,900 10,000
Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenue $ 400 $ 200 $ 600 $ 200