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Interim Consolidated Financial Statements - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Summary Of Significant Accounting Policy [Line Items]                
Deferred revenue   $ 128,435,000       $ 128,435,000   $ 145,207,000
Prepaid expenses and other current assets   13,292,000       13,292,000   18,942,000
Deferred commissions   10,884,000       10,884,000   13,731,000
Other assets   8,417,000       8,417,000   6,231,000
Retained earnings   126,006,000       126,006,000   123,010,000
Total assets   328,494,000       328,494,000   345,200,000
Total revenues   84,890,000     $ 80,369,000 258,992,000 $ 247,296,000  
Net income   $ 3,950,000     $ 3,953,000 $ 10,005,000 $ 13,047,000  
Diluted net income per share   $ 0.21     $ 0.22 $ 0.55 $ 0.72  
ASU No. 2018-02 [Member]                
Summary Of Significant Accounting Policy [Line Items]                
Reclassification adjustment to retained earnings for tax effects $ 26,000              
ASC 606 [Member] | Initial Application Period Cumulative Effect Transition [Member]                
Summary Of Significant Accounting Policy [Line Items]                
Deferred revenue   $ 7,800,000       $ 7,800,000    
Prepaid expenses and other current assets   (5,500,000)       (5,500,000)    
Deferred commissions   900,000       900,000    
Other assets   600,000       600,000    
Retained earnings   3,800,000       3,800,000    
ASC 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                
Summary Of Significant Accounting Policy [Line Items]                
Deferred revenue   (9,600,000)       (9,600,000)    
Total assets   (6,800,000)       (6,800,000)    
Total revenues   (900,000)       (1,500,000)    
Net income   $ (800,000)       $ (1,000,000)    
Diluted net income per share   $ 0.04       $ 0.05    
Research Services [Member]                
Summary Of Significant Accounting Policy [Line Items]                
Out-of-period correction revenue     $ 1,000,000          
Out-of-period correction revenue, after tax     $ 700,000          
Total revenues   $ 56,332,000     $ 54,235,000 $ 166,332,000 $ 160,553,000  
Understatement of Revenue from Reprint Product Line [Member]                
Summary Of Significant Accounting Policy [Line Items]                
Out-of-period correction revenue       $ 800,000       200,000
Out-of-period correction revenue, after tax       $ 500,000       $ 100,000