| 
           Related Party Transactions (Details) (Memorial Sloan Kettering Cancer Center [Member], USD $) 
         | 
        3 Months Ended | 
|---|---|
| 
           Mar. 31, 2014 
         | 
      |
| 
           New Drug Application [Member] 
         | 
        |
| Summary of milestone payments related to related party | |
| Milestones payments | $ 750,000 | 
| 
           Receipt of Regulatory Approval From U.S. FDA [Member] 
         | 
        |
| Summary of milestone payments related to related party | |
| Milestones payments | $ 1,750,000 |