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Interim Consolidated Financial Statements - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 02, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Summary Of Significant Accounting Policy [Line Items] |  |  |  |
Expected revenue performance obligation |  | $ 155,425,000 |  | $ 145,207,000
Prepaid expenses and other current assets |  | 18,641,000 |  | 18,942,000
Deferred commissions |  | 14,722,000 |  | 13,731,000
Other assets |  | 6,942,000 |  | 6,231,000
Retained earnings |  | 121,495,000 |  | 123,010,000
Total assets |  | 340,736,000 |  | $ 345,200,000
Total revenues |  | 77,749,000 | $ 77,194,000 |
Net loss |  | $ (1,733,000) | $ 3,030,000 |
Basic loss per common share |  | $ (0.10) | $ 0.17 |
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] |  |  |  |
Expected revenue performance obligation |  | $ 7,800,000 |  |
Prepaid expenses and other current assets |  | (5,500,000) |  |
Deferred commissions |  | 900,000 |  |
Other assets |  | 600,000 |  |
Retained earnings |  | 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] |  |  |  |
Expected revenue performance obligation |  | (11,200,000) |  |
Total assets |  | (9,000,000) |  |
Total revenues |  | (2,300,000) |  |
Net loss |  | $ 1,500,000 |  |
Basic loss per common share |  | $ 0.09 |  |

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