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Acquisition of eSignLive - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 25, 2015 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 5,012 | $ 478 | $ 2,825 | $ 2,199 | $ 3,484 | $ 11,182 | $ 13,852 | $ 13,634 | $ 10,514 | $ 42,151 | $ 33,484
Statutory income tax rate |  |  |  |  |  |  |  |  |  | 34.00% | 34.00% | 35.00%
Estimated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 8,849 | $ 4,942 | $ 4,532
Silanis Technology Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 75,000 |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 541 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | (2,168) |
Business combination provisional information initial accounting incomplete adjustment liabilities |  | 9,146 |  |  |  |  |  |  |  |  |  |
Business combination provisional information initial accounting incomplete adjustment goodwill |  | 9,146 |  |  |  |  |  |  |  |  |  |
Business combination provisional information initial accounting incomplete adjustment tax provision |  | $ 2,344 |  |  |  |  |  |  |  |  |  |
Estimated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |  |  |  | 6,060 | 6,060
Estimated amortization of fair value adjustment of acquired deferred revenue |  |  |  |  |  |  |  |  |  |  | (4,000) | 0
Reclassify non-recurring transaction expenses |  |  |  |  |  |  |  |  |  |  |  | 5,812
Reverse benefit of refundable tax credits |  |  |  |  |  |  |  |  |  |  | 1,021 | $ 1,588
Silanis Technology Inc [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related expense |  |  |  |  |  |  |  |  |  |  | $ 2,374 |
Silanis Technology Inc [Member] | Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00%

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