Commitments and Contingencies (Details) - Memorial Sloan Kettering Cancer Center [Member] |
6 Months Ended |
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Jun. 30, 2018
USD ($)
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| New Drug Application [Member] | |
| Summary of milestone payments related to related party | |
| Milestone payments | $ 750,000 |
| Receipt of regulatory approval from the U.S. FDA [Member] | |
| Summary of milestone payments related to related party | |
| Milestone payments | $ 1,750,000 |
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