Related Party Transactions (Details) - Memorial Sloan Kettering Cancer Center [Member] |
12 Months Ended |
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Dec. 31, 2017
USD ($)
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| Receipt Of Regulatory Approval From U S Fda [Member] | |
| Summary of milestone payments related to related party | |
| Milestone payments on approval | $ 1,750,000 |
| New Drug Application [Member] | |
| Summary of milestone payments related to related party | |
| Milestone payments on approval | $ 750,000 |
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