Annual report pursuant to Section 13 and 15(d)

Goodwill - Reconciliation of Changes to Carrying Amount of Goodwill (Detail)

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Goodwill - Reconciliation of Changes to Carrying Amount of Goodwill (Detail) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Goodwill [Roll Forward]      
Goodwill Beginning Balance $ 69,262,000 $ 42,268,000 $ 42,268,000
Adjustments     0
Adjustments to purchase price of Mobile Posse 1,483,000    
Purchases 9,431,000 26,994,000  
Goodwill Ending Balance 80,176,000 69,262,000 $ 42,268,000
Loss on impairment of goodwill $ 0 $ 0