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Investment in Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]      
Fair value of financial assets measured at fair value on a recurring basis $ 325,186 $ 325,186 $ 291,762
Preferred stock      
Schedule of Investments [Line Items]      
Fair value of financial assets measured at fair value on a recurring basis $ 120,000 $ 120,000  
ZIOPHARM Oncology, Inc.      
Schedule of Investments [Line Items]      
Preferred shares, stated value (in usd per share) $ 1,200 $ 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 100,000