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Acquisition - Additional Information (Detail) - Sonar Acquisition - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired 100.00%   100.00%
Cash paid for business acquisition $ 8,496    
Indemnification obligations period 12 months    
Identifiable intangible assets   $ 5,052  
Weighted average useful life   4 years 7 months 6 days  
Finite-lived intangible assets, amortization method   straight-line method  
Maximum      
Business Acquisition [Line Items]      
Stock Issued During Period Shares Acquisitions 389,000    
Acquired identifiable intangible assets amortization period   60 months  
Minimum      
Business Acquisition [Line Items]      
Stock Issued During Period Shares Acquisitions 0    
Acquired identifiable intangible assets amortization period   24 months  
Class B      
Business Acquisition [Line Items]      
Stock Issued During Period Shares Acquisitions 389,000    
Contingent consideration, description     Up to 389,000 shares of  Class B common stock based upon the achievement of certain financial target goals.
Common stock issued value acquisitions deferred $ 3,800    
Stock issued during the period, shares 1,000,000.0    
Common stock issuance period 3 years    
Class B | Maximum      
Business Acquisition [Line Items]      
Stock Issued During Period Shares Acquisitions 389,000