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Summary of Changes in Carrying Amount of Goodwill (Detail) (Parenthetical) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Total consideration $ 13,200,000 $ 11,800,000
Adjustment to goodwill $ 88,000 [1] $ 61,000
[1] Included working capital adjustments finalized subsequent to the Sonar acquisition in December 2019, resulting in total consideration of approximately $13.2 million and an adjustment to goodwill in the amount of $88,000 during the nine months ended September 30, 2020