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Capital Structure - Capitalization Information (Details)
 12 Months Ended
Nov. 14, 2017
USD ($)
Oct. 17, 2017
USD ($)
Dec. 31, 2017
USD ($)
vote
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Oct. 16, 2017
$ / shares
shares
Feb. 04, 2016
USD ($)
Equity, Class of Treasury Stock [Line Items]              
Authorized capital stock (in shares) | shares     110,000,000        
Par value per share of capital stock (in dollars per share) | $ / shares     $ 0.0001        
Designated common stock (in shares) | shares     100,000,000 100,000,000      
Designated preferred stock (in shares) | shares     10,000,000        
Preferred stock, shares outstanding (in shares) | shares     0 0      
Common stock, shares outstanding (in shares) | shares     46,965,000 45,292,000      
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001      
Issuance of common stock in connection with Openwave acquisition       $ 22,000,000      
Contingent consideration obligation       $ 2,833,000      
Share Repurchase Program 2016              
Equity, Class of Treasury Stock [Line Items]              
Amount authorized to be purchased under stock repurchase program             $ 100,000,000
Number of shares repurchased under program (in shares) | shares       1,300,000      
Value of shares repurchased under program       $ 40,000,000      
Common Stock              
Equity, Class of Treasury Stock [Line Items]              
Number of votes per share (vote) | vote     1        
Dividends     $ 0        
Investment Funds Affiliated with Sirius              
Equity, Class of Treasury Stock [Line Items]              
Common stock, shares outstanding (in shares) | shares           5,994,667  
Common stock, par value (in dollars per share) | $ / shares           $ 0.0001  
Intralinks Holdings, Inc.              
Equity, Class of Treasury Stock [Line Items]              
Cash paid for acquisition   $ 854,376,000          
Reimbursement paid $ 5,000,000            
Issuance of common stock in connection with Openwave acquisition   977,300,000 $ 4,700,000 $ 0 $ 0    
Maximum | Intralinks Holdings, Inc.              
Equity, Class of Treasury Stock [Line Items]              
Contingent consideration obligation 25,000,000            
Impala | Intralinks Holdings, Inc.              
Equity, Class of Treasury Stock [Line Items]              
Cash paid for acquisition 991,000,000            
Potential cash proceeds $ 440,000,000            
Issuance of common stock in connection with Openwave acquisition   977,300,000          
Impala | Maximum | Intralinks Holdings, Inc.              
Equity, Class of Treasury Stock [Line Items]              
Contingent consideration obligation   $ 25,000,000.0