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Schedule of Deferred Contract Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Condensed Income Statements Captions [Line Items]      
Deferred contract costs and other non-current assets $ 9,438   $ 10,259
Sales and Marketing Expense      
Condensed Income Statements Captions [Line Items]      
Deferred contract costs and other non-current assets 5,201   5,624
Costs to obtain contracts included in sales and marketing expense 745 $ 881  
Cost of Revenue      
Condensed Income Statements Captions [Line Items]      
Deferred contract costs and other non-current assets 3,395   $ 3,639
Costs to obtain contracts included in sales and marketing expense $ 351 $ 375