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Summary of Significant Accounting Policies - Additional Information (Details) |  | 9 Months Ended
--- | --- | ---
Jun. 01, 2014 USD ($) | Sep. 30, 2018 USD ($) Subsidary | Sep. 30, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Marketable Securities, Realized Gain (Loss) |  | $ 0 | $ 0
Impairments of long-lived assets |  | $ 0 | $ 0
Number of subsidiary corporations owned | Subsidary |  | 7 |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Marketable securities stated maturity period |  | 1 year |
Maximum | CPRIT |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Research grant contract amount | $ 19,800,000 |  |

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