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Capital Structure - Capitalization Information (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 14, 2017 USD ($) | Oct. 17, 2017 USD ($) | Dec. 31, 2017 USD ($) vote $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Oct. 16, 2017 $ / shares shares | Feb. 04, 2016 USD ($)
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Authorized capital stock (in shares) | shares |  |  | 110,000,000 |  |  |  |
Par value per share of capital stock (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |
Designated common stock (in shares) | shares |  |  | 100,000,000 | 100,000,000 |  |  |
Designated preferred stock (in shares) | shares |  |  | 10,000,000 |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  | 0 | 0 |  |  |
Common stock, shares outstanding (in shares) | shares |  |  | 46,965,000 | 45,292,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 | $ 0.0001 |  |  |
Issuance of common stock in connection with Openwave acquisition |  |  |  | $ 22,000,000 |  |  |
Contingent consideration obligation |  |  |  | $ 2,833,000 |  |  |
Share Repurchase Program 2016 |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Amount authorized to be purchased under stock repurchase program |  |  |  |  |  |  | $ 100,000,000
Number of shares repurchased under program (in shares) | shares |  |  |  | 1,300,000 |  |  |
Value of shares repurchased under program |  |  |  | $ 40,000,000 |  |  |
Common Stock |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of votes per share (vote) | vote |  |  | 1 |  |  |  |
Dividends |  |  | $ 0 |  |  |  |
Investment Funds Affiliated with Sirius |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  | 5,994,667 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |
Intralinks Holdings, Inc. |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Cash paid for acquisition |  | $ 854,376,000 |  |  |  |  |
Reimbursement paid | $ 5,000,000 |  |  |  |  |  |
Issuance of common stock in connection with Openwave acquisition |  | 977,300,000 | $ 4,700,000 | $ 0 | $ 0 |  |
Maximum | Intralinks Holdings, Inc. |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Contingent consideration obligation | 25,000,000 |  |  |  |  |  |
Impala | Intralinks Holdings, Inc. |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Cash paid for acquisition | 991,000,000 |  |  |  |  |  |
Potential cash proceeds | $ 440,000,000 |  |  |  |  |  |
Issuance of common stock in connection with Openwave acquisition |  | 977,300,000 |  |  |  |  |
Impala | Maximum | Intralinks Holdings, Inc. |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Contingent consideration obligation |  | $ 25,000,000.0 |  |  |  |  |

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