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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

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