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Grant Revenues - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 48 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2014 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 31, 2018
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Grant revenues |  |  | $ 2,378,000 | $ 0 | $ 3,888,000 |
Type of revenue [extensible list] |  | us-gaap:GrantMember | us-gaap:GrantMember | us-gaap:GrantMember | us-gaap:GrantMember |
CPRIT |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Grant contract term | 4 years |  |  |  |  |
Grant contract beginning date | Jun. 01, 2014 |  |  |  |  |
Grant contract expiration date | May 31, 2018 |  |  |  |  |
Grant revenues |  |  |  |  |  | $ 19,800,000
Type of revenue [extensible list] |  |  |  |  |  | us-gaap:GrantMember
CPRIT | Maximum |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Research grant contract amount | $ 19,800,000 |  |  |  |  |

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