Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Period Type:	duration

Acquisitions - Summary of Estimated Fair Value of Acquisition-Related Liabilities (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			12 Months Ended
	Sep. 30, 2020	Nov. 30, 2018	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Balance			$ 277	$ 868	$ 1,584
Change in fair value			(203)	(591)	(716)	$ (941)
Balance	$ 74		$ 74	$ 277	$ 868	1,584
Telmetrics Acquisition
Business Acquisition [Line Items]
Contingent consideration		$ 1,600				1,509
Sonar Acquisition
Business Acquisition [Line Items]
Contingent consideration	$ 1,016					$ 1,016