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Commitments, Contingencies, and Taxes - Additional Information (Detail) - USD ($)
1 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Nov. 30, 2018
Commitments Contingencies And Taxes [Line Items]      
Long term commitment amount   $ 7,706,000  
Percentage of valuation allowance 100.00% 100.00%  
Strategic Technology      
Commitments Contingencies And Taxes [Line Items]      
Long term commitment amount   $ 2,500,000  
Telmetrics Acquisition      
Commitments Contingencies And Taxes [Line Items]      
Maximum contingent consideration cash payable on acquisition   1,800,000 $ 3,000,000.0
Sonar Acquisition      
Commitments Contingencies And Taxes [Line Items]      
Maximum contingent consideration cash payable on acquisition $ 1,400,000    
Fair value of contingent consideration   $ 74,000,000  
Sonar Acquisition | Class B | Maximum      
Commitments Contingencies And Taxes [Line Items]      
Contingent consideration shares payable on acquisition 389,000