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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables summarize the Company's assets and liabilities that are measured at fair value on a recurring basis (in thousands):
|  |  | Fair Value Measurement at Reporting Date Using
Description | September 30, 2017 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 152,631 |  |  | $ | 152,631 |  |  | $ | — |  |  | $ | — |
Fair value option investments | 77,484 |  |  | — |  |  | — |  |  | 77,484 |
Available-for-sale securities: |  |  |  |  |  |  |
Convertible debt securities | 11,232 |  |  | — |  |  | — |  |  | 11,232 |
Redeemable preferred shares | 15,552 |  |  | — |  |  | — |  |  | 15,552 |
|  |  | Fair Value Measurement at Reporting Date Using
Description | December 31, 2016 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 202,241 |  |  | $ | 202,241 |  |  | $ | — |  |  | $ | — |
Fair value option investments | 82,584 |  |  | — |  |  | — |  |  | 82,584 |
Available-for-sale securities: |  |  |  |  |  |  |
Convertible debt securities | 10,038 |  |  | — |  |  | — |  |  | 10,038 |
Redeemable preferred shares | 17,444 |  |  | — |  |  | — |  |  | 17,444 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | 14,588 |  |  | — |  |  | — |  |  | 14,588 |
Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs [Table Text Block] | The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the three and nine months ended September 30, 2017 and 2016 (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Assets |  |  |  |  |  |  |  |
Fair value option investments: |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 81,439 |  |  | $ | 125,018 |  |  | $ | 82,584 |  |  | $ | 130,725 |
Total gains (losses) included in earnings |  | (3,955 | ) |  | (1,594 | ) |  | (5,100 | ) |  | (7,301 | )
Ending Balance |  | $ | 77,484 |  |  | $ | 123,424 |  |  | $ | 77,484 |  |  | $ | 123,424 |
Unrealized gains (losses) still held (1) |  | $ | (3,955 | ) |  | $ | (1,594 | ) |  | $ | (5,100 | ) |  | $ | (7,301 | )
Available-for-sale securities |  |  |  |  |  |  |  |  |  |
Convertible debt securities: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 10,868 |  |  | $ | 10,573 |  |  | $ | 10,038 |  |  | $ | 10,116 |
Acquisition of convertible debt security |  | — |  |  | — |  |  | 1,612 |  |  | — |
Proceeds at sale or maturity of convertible debt security |  | — |  |  | (1,685 | ) |  | (1,843 | ) |  | (1,685 | )
Total gains (losses) included in other comprehensive income (loss) |  | 146 |  |  | 566 |  |  | (387 | ) |  | 786 |
Total gains (losses) included in earnings (2) |  | 218 |  |  | 477 |  |  | 1,812 |  |  | 714 |
Ending Balance |  | $ | 11,232 |  |  | $ | 9,931 |  |  | $ | 11,232 |  |  | $ | 9,931 |
Unrealized gains (losses) still held (1) |  | $ | 364 |  |  | $ | 1,043 |  |  | $ | 1,180 |  |  | $ | 1,500 |
Redeemable preferred shares: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 15,923 |  |  | $ | 22,343 |  |  | $ | 17,444 |  |  | $ | 22,834 |
Total gains (losses) included in other comprehensive income (loss) |  | (371 | ) |  | (592 | ) |  | (1,892 | ) |  | (1,083 | )
Transfer to cost method investment classification upon elimination of redemption feature |  | — |  |  | (4,574 | ) |  | — |  |  | (4,574 | )
Ending Balance |  | $ | 15,552 |  |  | $ | 17,177 |  |  | $ | 15,552 |  |  | $ | 17,177 |
Unrealized (losses) gains still held (1) |  | $ | (371 | ) |  | $ | (592 | ) |  | $ | (1,892 | ) |  | $ | (1,083 | )
Liabilities |  |  |  |  |  |  |  |  |  |
Contingent Consideration: |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | — |  |  | $ | 14,788 |  |  | $ | 14,588 |  |  | $ | 10,781 |
Settlements of contingent consideration liabilities |  | — |  |  | — |  |  | (7,858 | ) |  | — |
Reclassification to non-fair value liabilities when no longer contingent |  | — |  |  | — |  |  | (6,778 | ) |  | (285 | )
Total losses (gains) included in earnings (3) |  | — |  |  | (162 | ) |  | 48 |  |  | 4,130 |
Ending Balance |  | $ | — |  |  | $ | 14,626 |  |  | $ | — |  |  | $ | 14,626 |
Unrealized losses (gains) still held (1) |  | $ | — |  |  | $ | (162 | ) |  | $ | — |  |  | $ | 4,004 |
(1) | Represents the unrealized losses or gains recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.
(2) | Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of an embedded derivative.
(3) | Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense (benefit), net" on the condensed consolidated statements of operations.
Fair Value of Financial Assets and Liabilities not Measured at Fair Value | The following table presents the carrying amounts and fair values of financial instruments that are not carried at fair value in the condensed consolidated financial statements (in thousands):
|  | September 30, 2017 |  | December 31, 2016
|  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Cost method investments |  | $ | 25,236 |  |  | $ | 32,044 |  |  | $ | 31,816 |  |  | $ | 35,369 |

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- Definition Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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