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Acquisition of eSignLive - Summary of Unaudited Pro Forma Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unaudited Pro Forma Financial Information |  |  |
Statutory tax rate | 35.00% | 34.00% | 34.00%
Estimated amortization of acquired identifiable intangible assets | $ 8,809 | $ 8,849 | $ 4,942
eSignLive |  |  |
Unaudited Pro Forma Financial Information |  |  |
Revenue |  |  | 256,416
Net income |  |  | $ 22,247
Pro Forma | eSignLive |  |  |
Unaudited Pro Forma Financial Information |  |  |
Statutory tax rate |  |  | 35.00%
Estimated amortization of acquired identifiable intangible assets |  |  | $ 6,060
Estimated amortization of fair value adjustment of acquired deferred revenue |  |  | (4,000)
Reverse benefit of refundable tax credits |  |  | $ (1,021)

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