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

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Name:	us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisition - Summary of Estimated Fair Value of Acquisition-Related Liabilities (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Change in fair value		$ (941,000)	$ (941,000)
Sonar Acquisition
Business Acquisition [Line Items]
Contingent consideration	$ 1,016,000
(Level 3)
Business Acquisition [Line Items]
Balance		1,584,000	1,509,000
Change in fair value		$ (1,584,000)	(941,000)
Balance	$ 1,584,000		1,584,000
(Level 3) \| Sonar Acquisition
Business Acquisition [Line Items]
Contingent consideration			$ 1,016,000