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Schedule of Capitalized Software Development Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounting Policies [Abstract]      
Capitalized $ 1,748 $ 3,472  
Amortized 2,162 $ 1,519  
Net book value $ 17,528   $ 17,942