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Acquisitions - Summary of Consideration for Acquisition (Detail) - USD ($) $ in Thousands	1 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Nov. 30, 2018	Sep. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Total				$ 13,200	$ 11,800
Telmetrics Acquisition
Business Acquisition [Line Items]
Cash			$ 10,161
Future consideration			1,600		1,509
Total			11,761		11,800
Callcap Acquisition
Business Acquisition [Line Items]
Cash			24,993
Fair value of equity consideration			10,017
Total			$ 35,010
Sonar Acquisition
Business Acquisition [Line Items]
Cash	$ 8,408	$ 8,500
Future consideration	1,016				$ 1,016
Fair value of equity consideration	3,803
Total	$ 13,227			$ 13,200

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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