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Goodwill (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Balance at December 31, 2018 $ 96,500,000  
HelloSign acquisition 132,700,000  
Effect of foreign currency translation 1,200,000  
Balance at March 31, 2019 230,400,000 $ 96,500,000
Goodwill impairment $ 0 $ 0