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Common Stock - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Nov. 30, 2018	Nov. 30, 2014
Callcap Acquisition
Equity, Class of Treasury Stock [Line Items]
Business acquisition, percentage of voting interests acquired			100.00%
Cash			$ 24,993
Sonar Acquisition
Equity, Class of Treasury Stock [Line Items]
Business acquisition, percentage of voting interests acquired		100.00%
Cash	$ 8,408	$ 8,500
Class B
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased				3,000,000
Class B | Callcap Acquisition
Equity, Class of Treasury Stock [Line Items]
Stock issued during the period, shares			3,400,000
Common stock issuance period			4 years
Class B | Sonar Acquisition
Equity, Class of Treasury Stock [Line Items]
Stock issued during the period, shares		1,000,000.0
Common stock issuance period		3 years
Class B | Sonar Acquisition | Maximum
Equity, Class of Treasury Stock [Line Items]
Future earnout consideration, shares		389,000

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