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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 |  |

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