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Stockholders' Equity - Subsequent Event - Shares of Preferred Stock (Details)
$ / shares in Units, $ in Millions
 6 Months Ended
Feb. 15, 2018
USD ($)
director
registration
$ / shares
shares
Nov. 14, 2017
USD ($)
Jun. 30, 2017
vote
Class of Stock [Line Items]      
Number of votes per share (vote) | vote     1
Series A Preferred Stock      
Class of Stock [Line Items]      
Number of votes per share (vote) | vote     1
Subsequent Event      
Class of Stock [Line Items]      
Preferred stock, dividend rate 14.50%    
Shares issued upon conversion | shares 0.0555556    
Conversion price (in usd per share) | $ / shares $ 18.00    
Number of elected directors 4    
Number of board of director members 10    
Number of board of director members elected by preferred stock holders 2    
Number of board of directors agreed upon to be elected meeting independence criteria 4    
Number of board of directors elected meeting independence criteria 2    
Minimum number of board of director members that preferred stock holders can appoint pursuant to certification 1    
Maximum ownership percentage threshold allowed for director election rights 30.00%    
Demand registrations allowed under agreement | registration 3    
Demand registrations allowed under agreement annually | registration 2    
Demand registration, minimum percentage of shares 10.00%    
Subsequent Event | Silver Private Holdings I, LLC      
Class of Stock [Line Items]      
Minimum number of board of director members that preferred stock holders can appoint pursuant to certification 2    
Subsequent Event | Silver Private Holdings I, LLC | EBITDA Non-Compliance      
Class of Stock [Line Items]      
Long-term debt, fair value, approval threshold | $ $ 10.0    
Fair market value of transaction, individual | $ 5.0    
Fair market value of transaction, aggregate | $ 10.0    
Capital expenditure threshold | $ $ 25.0    
Subsequent Event | Silver Private Holdings I, LLC | Conversion of Stock      
Class of Stock [Line Items]      
Percentage ownership after conversion 19.90%    
Voting percentage threshold of ownership 19.99%    
Subsequent Event | Ten Percent or Greater Ownership      
Class of Stock [Line Items]      
Number of elected directors 2    
Preferred stock, ownership percentage 10.00%    
Subsequent Event | Greater than Five and Less than Ten Percent Ownership      
Class of Stock [Line Items]      
Number of elected directors 1    
Subsequent Event | Greater than Five and Less than Ten Percent Ownership | Minimum      
Class of Stock [Line Items]      
Preferred stock, ownership percentage 5.00%    
Subsequent Event | Greater than Five and Less than Ten Percent Ownership | Maximum      
Class of Stock [Line Items]      
Preferred stock, ownership percentage 10.00%    
Intralinks Holdings, Inc. | Subsequent Event      
Class of Stock [Line Items]      
Payment of reimbursement fees | $ $ 5.0 $ 5.0  
Chief Executive Officer | Subsequent Event      
Class of Stock [Line Items]      
Number of elected directors 1    
Board of Directors Chairman | Subsequent Event      
Class of Stock [Line Items]      
Number of elected directors 1