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Summary of Significant Accounting Policies - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:                      
Net income $ 5,375 $ 3,950 $ 7,788 $ (1,733) $ 2,093 $ 3,953 $ 6,064 $ 3,030 $ 15,380 $ 15,140 $ 17,651
Accounts receivable                 2,588 (10,327) 7,963
Deferred commissions                 (1,077) (1,679) 1,477
Prepaid expenses and other current assets                 285 (4,146) 861
Deferred revenue                 (604) $ 8,586 $ (5,140)
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member]                      
Cash flows from operating activities:                      
Net income                 13,982    
Accounts receivable                 (1,952)    
Deferred commissions                 (994)    
Prepaid expenses and other current assets                 (43)    
Deferred revenue                 $ 5,580