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Goodwill - Schedule of Goodwill Activity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Beginning balance $ 80,853 $ 22,208  
Adjustment to provisional estimate of acquisition date fair values (24,419)    
Additions - eSignLive   60,331  
Net foreign currency translation (2,025) (1,686)  
Ending balance 54,409 80,853  
December 31, 2016 balance at cost     $ 55,209
Accumulated amortization     (800)
Ending balance $ 80,853 $ 22,208 $ 54,409