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Capital Structure - Preferred Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 15, 2018
Nov. 14, 2017
Oct. 17, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 19, 2017
Class of Stock [Line Items]              
Issuance of common stock in connection with Openwave acquisition         $ 22,000    
Cash           $ 1,172  
Common stock, shares outstanding (in shares)       46,965,000 45,292,000    
Intralinks Holdings, Inc.              
Class of Stock [Line Items]              
Issuance of common stock in connection with Openwave acquisition     $ 977,300 $ 4,700 $ 0 $ 0  
Cash             $ 39,370
Reimbursement paid   $ 5,000          
Silver Private Holdings I, LLC | Convertible Preferred Stock              
Class of Stock [Line Items]              
Issuance of common stock in connection with Openwave acquisition     $ 185,000        
Subsequent Event | Convertible Preferred Stock              
Class of Stock [Line Items]              
Preferred stock, par value (in dollars per share) $ 0.0001            
Preferred stock, liquidation preference (in dollars per share) $ 1,000            
Subsequent Event | Intralinks Holdings, Inc.              
Class of Stock [Line Items]              
Reimbursement paid $ 5,000            
Subsequent Event | Silver Private Holdings I, LLC              
Class of Stock [Line Items]              
Cash $ 97,700            
Silver Private Holdings I, LLC | Subsequent Event | Silver Private Holdings I, LLC              
Class of Stock [Line Items]              
Common stock, shares outstanding (in shares) 5,994,667