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Acquisition and Divestitures - Narrative (Details) - USD ($)
 12 Months Ended
Feb. 15, 2018
Nov. 14, 2017
Oct. 17, 2017
Feb. 01, 2017
Jan. 19, 2017
Dec. 29, 2016
Dec. 22, 2016
Dec. 16, 2016
Mar. 01, 2016
Dec. 31, 2015
Aug. 04, 2015
Feb. 23, 2015
Feb. 18, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 16, 2016
Business Acquisition [Line Items]                                  
Value of common stock paid for acquisition                             $ 22,000,000    
Contingent consideration obligation                             2,833,000    
Net assets acquired                   $ 99,765,000           $ 99,765,000  
Gain on sale of discontinued operations                           $ (122,842,000) (113,129,000) 0  
Proceeds from the sale of discontinued operations                           $ 928,171,000 $ 27,335,000 0  
Cash                   1,172,000           1,172,000  
Common stock, shares outstanding (in shares)                           46,965,000 45,292,000    
Mandatorily redeemable financial instrument                           $ 37,959,000 $ 0    
Total long-term debt, carrying value                           227,704,000 226,291,000    
STIH                                  
Business Acquisition [Line Items]                                  
Indefinite-lived license agreement             $ 10,000,000                    
Divestiture of SpeechCycle                                  
Business Acquisition [Line Items]                                  
Purchase price of divestiture       $ 13,500,000                          
Gain on sale of discontinued operations                           4,900,000      
Period of transition services agreement       1 year                          
Mirapoint Activation Business                                  
Business Acquisition [Line Items]                                  
Gain on sale           $ 1,400,000                      
Discontinued Operations, Disposed of by Sale | BPO                                  
Business Acquisition [Line Items]                                  
Gain on sale of discontinued operations                             113,130,000 0  
Period of transition services agreement               3 years                  
Discontinued Operations, Disposed of by Sale | BPO | STIH                                  
Business Acquisition [Line Items]                                  
Purchase price of divestiture               $ 27,300,000                  
Proceeds from the sale of discontinued operations               83,000,000                  
Discontinued Operations, Disposed of by Sale | BPO | STIN                                  
Business Acquisition [Line Items]                                  
Purchase price of divestiture               $ 140,800,000                  
Ownership interest in STI               30.00%                  
Discontinued Operations, Disposed of by Sale | BPO | STIN | STIH                                  
Business Acquisition [Line Items]                                  
Purchase price of divestiture               $ 69,800,000                  
Ownership interest in STI by Sequential Technology Holdings, LLC               70.00%                  
Selling, general and administrative                                  
Business Acquisition [Line Items]                                  
Acquisition related costs                           13,000,000 10,900,000 1,300,000  
Net Revenue | BPO | STIH                                  
Business Acquisition [Line Items]                                  
Impairment and reduction of intangible asset             600,000                    
Razorsight Corporation                                  
Business Acquisition [Line Items]                                  
Value of common stock paid for acquisition                     $ 25,300,000            
Contingent consideration obligation                     $ 15,000,000            
Net assets acquired                   25,284,000           25,284,000  
Cash                   1,172,000           1,172,000  
F-Secure Corporation                                  
Business Acquisition [Line Items]                                  
Consideration transferred                         $ 49,500,000        
Net assets acquired                   49,481,000           49,481,000  
Cash paid for acquisition                       $ 59,500,000          
Intralinks Holdings, Inc.                                  
Business Acquisition [Line Items]                                  
Value of common stock paid for acquisition     $ 977,300,000                     4,700,000 0 0  
Consideration transferred     859,078,000                            
Net assets acquired         $ 859,078,000                        
Intangible assets         411,577,000                        
Cash paid for acquisition     854,376,000                            
Reimbursement paid   $ 5,000,000                              
Cash         39,370,000                        
Mandatorily redeemable financial instrument                           33,600,000      
Intralinks Holdings, Inc. | Impala                                  
Business Acquisition [Line Items]                                  
Value of common stock paid for acquisition     977,300,000                            
Consideration transferred     1,000,000,000                            
Cash paid for acquisition   991,000,000                              
Potential cash proceeds   $ 440,000,000                              
Openwave Messaging                                  
Business Acquisition [Line Items]                                  
Value of common stock paid for acquisition                 $ 22,000,000         $ 0 22,000,000 0  
Consideration transferred                 114,538,000                
Net assets acquired                 114,538,000                
Cash paid for acquisition                 92,538,000                
Patent settlement                 10,000,000                
Cash                 $ 4,110,000                
Zentry, LLC                                  
Business Acquisition [Line Items]                                  
Consideration transferred                   48,000,000              
Net assets acquired                   $ 25,000,000         $ 25,000,000 25,000,000  
SNCR, LLC                                  
Business Acquisition [Line Items]                                  
Intangible assets acquired                                 $ 12,800,000
Zentry, LLC | Variable Interest Entity, Primary Beneficiary                                  
Business Acquisition [Line Items]                                  
Ownership percentage                   67.00%              
Call Option | Zentry, LLC                                  
Business Acquisition [Line Items]                                  
Option indexed to equity, threshold for cash or share settlement                   $ 200,000,000              
Number of trading days                   30 days              
Secured Debt | Goldman Sachs Bank USA                                  
Business Acquisition [Line Items]                                  
Secured senior loan         900,000,000                        
Proceeds from line of credit         $ 900,000,000                        
STIH | Goldman Sachs Bank USA                                  
Business Acquisition [Line Items]                                  
Total long-term debt, carrying value             40,000,000                    
F-Secure Corporation | F-Secure Corporation                                  
Business Acquisition [Line Items]                                  
Non-exclusive perpetual license agreement                         $ 10,000,000        
Silver Private Holdings I, LLC                                  
Business Acquisition [Line Items]                                  
Sale of stock, price per share   $ 14.56                              
Put right consideration   $ 87,300,000                              
Convertible Preferred Stock | Silver Private Holdings I, LLC                                  
Business Acquisition [Line Items]                                  
Value of common stock paid for acquisition     185,000,000                            
Subsequent Event | Intralinks Holdings, Inc.                                  
Business Acquisition [Line Items]                                  
Reimbursement paid $ 5,000,000                                
Subsequent Event | Silver Private Holdings I, LLC                                  
Business Acquisition [Line Items]                                  
Cash $ 97,700,000                                
Subsequent Event | Silver Private Holdings I, LLC | Silver Private Holdings I, LLC                                  
Business Acquisition [Line Items]                                  
Common stock, shares outstanding (in shares) 5,994,667                                
Subsequent Event | Convertible Preferred Stock                                  
Business Acquisition [Line Items]                                  
Preferred stock, par value (in dollars per share) $ 0.0001                                
Preferred stock, liquidation preference (in dollars per share) $ 1,000                                
Subsequent Event | Convertible Preferred Stock | Silver Private Holdings I, LLC                                  
Business Acquisition [Line Items]                                  
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Shares 185,000                                
Licensing Agreements | Discontinued Operations, Disposed of by Sale | BPO | STIH                                  
Business Acquisition [Line Items]                                  
Purchase price of divestiture               $ 10,000,000                  
Licensing Agreements | Zentry, LLC                                  
Business Acquisition [Line Items]                                  
Intangible assets                   $ 23,000,000           $ 23,000,000  
Maximum | Intralinks Holdings, Inc.                                  
Business Acquisition [Line Items]                                  
Contingent consideration obligation   $ 25,000,000                              
Maximum | Intralinks Holdings, Inc. | Impala                                  
Business Acquisition [Line Items]                                  
Contingent consideration obligation     $ 25,000,000.0                            
Indirect Guarantee of Indebtedness | Goldman Sachs Bank USA                                  
Business Acquisition [Line Items]                                  
Current carrying value             $ 30,000,000