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Interim Consolidated Financial Statements - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 02, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |
Deferred revenue |  | $ 143,023,000 |  |  | $ 143,023,000 |  | $ 145,207,000
Prepaid expenses and other current assets |  | 12,789,000 |  |  | 12,789,000 |  | 18,942,000
Deferred commissions |  | 12,514,000 |  |  | 12,514,000 |  | 13,731,000
Other assets |  | 7,756,000 |  |  | 7,756,000 |  | 6,231,000
Retained earnings |  | 125,698,000 |  |  | 125,698,000 |  | 123,010,000
Total assets |  | 326,142,000 |  |  | 326,142,000 |  | 345,200,000
Total revenues |  | 96,353,000 |  | $ 89,733,000 | 174,102,000 | $ 166,927,000 |
Net income |  | $ 7,788,000 |  | $ 6,064,000 | $ 6,055,000 | $ 9,094,000 |
Diluted net income per share |  | $ 0.43 |  | $ 0.34 | $ 0.33 | $ 0.50 |
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 |  | (9,000,000) |  |  | (9,000,000) |  |
Total assets |  | (7,000,000) |  |  | (7,000,000) |  |
Total revenues |  | (100,000) |  |  | (2,400,000) |  |
Net income |  | $ (300,000) |  |  | $ (1,800,000) |  |
Diluted net income per share |  | $ 0.01 |  |  | $ 0.10 |  |
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 |  | $ 58,300,000 |  | $ 54,575,000 | $ 110,000,000 | $ 106,318,000 |
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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