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License, Clinical Trial and Sponsored Research Agreements - Additional Information (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2019 | May 31, 2017 | Feb. 28, 2017 | May 31, 2019 | Mar. 31, 2019
City of Hope | CS1 License (MB-104) [Member] |  |  |  |  |
Payment Of Upfront Fees |  | $ 600,000 |  |  |
Revenue Recognition Milestone Method Payments Due |  | 14,900,000 |  |  |
Cost of Goods and Services Sold |  | $ 50,000 |  |  |
Research And Development Expense, Sponsored Research Payment |  |  |  | $ 200,000 |
City of Hope | CD123 License (MB-102) [Member] |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  | $ 14,500,000 |  |
Cost of Goods and Services Sold |  |  | $ 25,000 |  |
Research And Development Expense, Sponsored Research Payment |  |  |  |  | $ 300,000
Nationwide Children's Hospital - C134 |  |  |  |  |
Payment Of Upfront Fees | $ 200,000 |  |  |  |
Licensing Arrangements Additional Costs Incurred | $ 152,800,000 |  |  |  |

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