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Stockholders' Equity - Subsequent Event - Share Purchase Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
Feb. 15, 2018
Nov. 14, 2017
Jan. 19, 2017
Oct. 16, 2017
Jun. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]            
Common stock, shares outstanding (shares)         46,142,000 45,292,000
Common stock, par value (in dollars per share)         $ 0.0001 $ 0.0001
Contingent consideration obligation         $ 2,831 $ 2,833
Intralinks Holdings, Inc.            
Class of Stock [Line Items]            
Total preliminary cash consideration transferred     $ 854,376      
Subsequent Event | Intralinks Holdings, Inc.            
Class of Stock [Line Items]            
Contingent consideration obligation   $ 25,000        
Payment of reimbursement fees $ 5,000 $ 5,000        
Subsequent Event | Silver Private Holdings I, LLC | Convertible Preferred Stock            
Class of Stock [Line Items]            
Shares issued as consideration 185,000          
Subsequent Event | Investment Funds Affiliated with Sirius            
Class of Stock [Line Items]            
Common stock, shares outstanding (shares)   5,994,667   5,994,667    
Common stock, par value (in dollars per share)       $ 0.0001    
Impala | Subsequent Event | Intralinks Holdings, Inc.            
Class of Stock [Line Items]            
Total preliminary cash consideration transferred   $ 991,000        
Potential cash proceeds   $ 440,000