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Investment in Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |  |  |
Fair value of financial assets measured at fair value on a recurring basis |  | $ 376,093 | $ 376,093 |  | $ 291,762
Noncash dividend income on preferred shares |  |  | 3,676 | $ 0 |
Preferred stock |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair value of financial assets measured at fair value on a recurring basis |  | $ 123,676 | $ 123,676 |  |
ZIOPHARM Oncology, Inc. |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Preferred shares, stated value (in usd per share) | $ 1,200 |  |  |  |
Threshold consecutive trading days, conversion of shares |  |  | 20 days |  |
Preferred shares, dividend rate (in usd per share) |  |  | $ 12.00 |  |
Preferred shares, dividend rate, for unconverted shares after conversion event (in usd per share) |  |  | 24.00 |  |
ZIOPHARM Oncology, Inc. | Minimum |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Preferred shares, conversion calculation, divisor (in usd per share) |  |  | $ 1.00 |  |
Other Contractual Payments | Upfront and Milestone Payments | ZIOPHARM Oncology, Inc. |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Collaborative arrangement consideration received, number of preferred shares (in shares) | 100,000 |  |  |  |
ZIOPHARM Oncology, Inc. |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Dividend income, number of preferred shares received (in shares) |  | 3,063 | 3,063 |  |
Noncash dividend income on preferred shares |  | $ 3,676 | $ 3,676 |  |

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