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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]  
Summarized Unaudited Financial Information for the Equity Method Investments
Summarized unaudited financial data as of June 30, 2016 and December 31, 2015 and for the three and six months ended June 30, 2016 and 2015, for the Company's equity method investments are shown in the following tables. Summarized unaudited financial data for ZIOPHARM has been included for the three and six months ended June 30, 2015 as the Company determined it had significant influence over ZIOPHARM until the Company distributed all of its common stock held in ZIOPHARM to its shareholders in June 2015.
 
June 30,
2016
 
December 31,
2015
Current assets
$
70,182

 
$
28,123

Non-current assets
11,059

 
1,539

Total assets
81,241

 
29,662

Current liabilities
7,633

 
6,274

Net assets
$
73,608

 
$
23,388


 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Revenues
$
47

 
$
514

 
$
329

 
$
1,150

Operating expenses
14,383

 
25,424

 
32,043

 
109,493

Operating loss
(14,336
)
 
(24,910
)
 
(31,714
)
 
(108,343
)
Other
1,424

 
4

 
1,427

 
3

Net loss
$
(12,912
)
 
$
(24,906
)
 
$
(30,287
)
 
$
(108,340
)