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Fair Value Measurements - Level 3 Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 14, 2017 | Oct. 17, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 15, 2018
Changes in fair value of the Company’s Level 3 redeemable noncontrolling interests |  |  |  |  |  |
Issuance of common stock in connection with Openwave acquisition |  |  |  | $ 22,000 |  |
Common stock, shares outstanding (in shares) |  |  | 46,965,000 | 45,292,000 |  |
Redeemable Noncontrolling Interests |  |  |  |  |  |
Changes in fair value of the Company’s Level 3 redeemable noncontrolling interests |  |  |  |  |  |
Balance at beginning of period |  |  | $ 25,280 |  |  |
Fair value and other adjustments |  |  | 9,291 |  |  |
Net loss attributable to interests in subsidiaries |  |  | (9,291) |  |  |
Balance at end of period |  |  | 25,280 | $ 25,280 |  |
Intralinks Holdings, Inc. |  |  |  |  |  |
Changes in fair value of the Company’s Level 3 redeemable noncontrolling interests |  |  |  |  |  |
Issuance of common stock in connection with Openwave acquisition |  | $ 977,300 | $ 4,700 | $ 0 | $ 0 |
Convertible Preferred Stock | Silver Private Holdings I, LLC |  |  |  |  |  |
Changes in fair value of the Company’s Level 3 redeemable noncontrolling interests |  |  |  |  |  |
Issuance of common stock in connection with Openwave acquisition |  | $ 185,000 |  |  |  |
Silver Private Holdings I, LLC |  |  |  |  |  |
Changes in fair value of the Company’s Level 3 redeemable noncontrolling interests |  |  |  |  |  |
Put right consideration | $ 87,300 |  |  |  |  |
Silver Private Holdings I, LLC | Subsequent Event | Silver Private Holdings I, LLC |  |  |  |  |  |
Changes in fair value of the Company’s Level 3 redeemable noncontrolling interests |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 5,994,667

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