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Summary of Significant Accounting Policies - Summary of Effect of Adopting ASC 606 In Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable, net $ 67,318 $ 70,023    
Deferred commissions 15,677 13,731    
Prepaid expenses and other current assets 12,802 18,942    
Total current assets 236,093 236,819    
Other assets 5,310 6,231    
Total assets 353,524 345,200    
Deferred revenue 135,332 145,207    
Total current liabilities 189,985 195,053    
Total liabilities 201,924 204,011    
Retained earnings 127,717 123,010    
Total stockholders’ equity 151,600 141,189 $ 150,036 $ 127,302
Total liabilities and stockholders’ equity 353,524 $ 345,200    
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member]        
Accounts receivable, net 71,858      
Deferred commissions 14,725      
Prepaid expenses and other current assets 18,587      
Total current assets 245,467      
Other assets 4,748      
Total assets 362,336      
Deferred revenue 149,344      
Total current liabilities 203,997      
Total liabilities 215,936      
Retained earnings 122,517      
Total stockholders’ equity 146,400      
Total liabilities and stockholders’ equity $ 362,336