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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
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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 |  |  |  |

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