Acquisition of eSignLive - Summary of Acquired Intangible Assets (Details) - eSignLive - USD ($) $ in Thousands	Nov. 25, 2015	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets
Identified intangible assets	$ 47,400	$ 47,400
Tradenames
Acquired Finite-Lived Intangible Assets
Identified intangible assets	$ 2,400
Identifiable Intangible Assets, Weighted average amortization period	10 years
Technology
Acquired Finite-Lived Intangible Assets
Identified intangible assets	$ 10,000
Identifiable Intangible Assets, Weighted average amortization period	5 years
Non-compete Agreements
Acquired Finite-Lived Intangible Assets
Identified intangible assets	$ 8,000
Identifiable Intangible Assets, Weighted average amortization period	5 years
Customer Relationships
Acquired Finite-Lived Intangible Assets
Identified intangible assets	$ 27,000
Identifiable Intangible Assets, Weighted average amortization period	12 years