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Investment in Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Investments [Line Items] |  |  |  |
Noncash dividend income on preferred shares |  | $ 7,421 | $ 0 | $ 0
ZIOPHARM Oncology, Inc. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Preferred shares, stated value (in usd per share) | $ 1,200 |  |  |
Threshold consecutive trading days, conversion in 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 |  |
Minimum | ZIOPHARM Oncology, Inc. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Preferred shares, conversion calculation, divisor (in usd per share) |  | $ 1.00 |  |
ZIOPHARM Oncology, Inc. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Dividend income, number of preferred shares received (in shares) |  | 6,184 |  |
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 |  |  |

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- Definition Number of shares of preferred stock issued as dividends during the period. Excludes stock splits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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