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Acquisition and Divestitures - Narrative (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2018 | Nov. 14, 2017 | Oct. 17, 2017 | Feb. 01, 2017 | Jan. 19, 2017 | Dec. 29, 2016 | Dec. 22, 2016 | Dec. 16, 2016 | Mar. 01, 2016 | Dec. 31, 2015 | Aug. 04, 2015 | Feb. 23, 2015 | Feb. 18, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 16, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 |  |
Contingent consideration obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,833,000 |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | $ 99,765,000 |  |  |  |  |  | $ 99,765,000 |
Gain on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (122,842,000) | (113,129,000) | 0 |
Proceeds from the sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 928,171,000 | $ 27,335,000 | 0 |
Cash |  |  |  |  |  |  |  |  |  | 1,172,000 |  |  |  |  |  | 1,172,000 |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,965,000 | 45,292,000 |  |
Mandatorily redeemable financial instrument |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,959,000 | $ 0 |  |
Total long-term debt, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | 227,704,000 | 226,291,000 |  |
STIH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived license agreement |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Divestiture of SpeechCycle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of divestiture |  |  |  | $ 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,900,000 |  |  |
Period of transition services agreement |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Mirapoint Activation Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | BPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,130,000 | 0 |
Period of transition services agreement |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | BPO | STIH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of divestiture |  |  |  |  |  |  |  | $ 27,300,000 |  |  |  |  |  |  |  |  |
Proceeds from the sale of discontinued operations |  |  |  |  |  |  |  | 83,000,000 |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | BPO | STIN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of divestiture |  |  |  |  |  |  |  | $ 140,800,000 |  |  |  |  |  |  |  |  |
Ownership interest in STI |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | BPO | STIN | STIH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of divestiture |  |  |  |  |  |  |  | $ 69,800,000 |  |  |  |  |  |  |  |  |
Ownership interest in STI by Sequential Technology Holdings, LLC |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 | 10,900,000 | 1,300,000 |
Net Revenue | BPO | STIH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment and reduction of intangible asset |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |
Razorsight Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock paid for acquisition |  |  |  |  |  |  |  |  |  |  | $ 25,300,000 |  |  |  |  |  |
Contingent consideration obligation |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | 25,284,000 |  |  |  |  |  | 25,284,000 |
Cash |  |  |  |  |  |  |  |  |  | 1,172,000 |  |  |  |  |  | 1,172,000 |
F-Secure Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,500,000 |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | 49,481,000 |  |  |  |  |  | 49,481,000 |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 59,500,000 |  |  |  |  |
Intralinks Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock paid for acquisition |  |  | $ 977,300,000 |  |  |  |  |  |  |  |  |  |  | 4,700,000 | 0 | 0 |
Consideration transferred |  |  | 859,078,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  | $ 859,078,000 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 411,577,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  | 854,376,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement paid |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 39,370,000 |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable financial instrument |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,600,000 |  |  |
Intralinks Holdings, Inc. | Impala |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock paid for acquisition |  |  | 977,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  | 991,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential cash proceeds |  | $ 440,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Openwave Messaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock paid for acquisition |  |  |  |  |  |  |  |  | $ 22,000,000 |  |  |  |  | $ 0 | 22,000,000 | 0 |
Consideration transferred |  |  |  |  |  |  |  |  | 114,538,000 |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  | 114,538,000 |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  | 92,538,000 |  |  |  |  |  |  |  |
Patent settlement |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | $ 4,110,000 |  |  |  |  |  |  |  |
Zentry, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  | $ 25,000,000 | 25,000,000 |
SNCR, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,800,000
Zentry, LLC | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 67.00% |  |  |  |  |  |  |
Call Option | Zentry, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to equity, threshold for cash or share settlement |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |
Secured Debt | Goldman Sachs Bank USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured senior loan |  |  |  |  | 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from line of credit |  |  |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |
STIH | Goldman Sachs Bank USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, carrying value |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |
F-Secure Corporation | F-Secure Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-exclusive perpetual license agreement |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Silver Private Holdings I, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share |  | $ 14.56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Put right consideration |  | $ 87,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock | Silver Private Holdings I, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock paid for acquisition |  |  | 185,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Intralinks Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement paid | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Silver Private Holdings I, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 97,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Silver Private Holdings I, LLC | Silver Private Holdings I, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 5,994,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Convertible Preferred Stock | Silver Private Holdings I, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Shares | 185,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Licensing Agreements | Discontinued Operations, Disposed of by Sale | BPO | STIH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of divestiture |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Licensing Agreements | Zentry, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  | $ 23,000,000 |
Maximum | Intralinks Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Intralinks Holdings, Inc. | Impala |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect Guarantee of Indebtedness | Goldman Sachs Bank USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current carrying value |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |

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