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Commitments and Contingencies (Details) - lawsuit |  | 1 Months Ended | 33 Months Ended
--- | --- | --- | ---
Mar. 30, 2017 | Jan. 31, 2016 | Sep. 30, 2018
Punitive Lawsuits Filed in the United States District Court for the Southern District of Texas |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits dismissed (lawsuit) | 4 |  |
Number of lawsuits filed (lawsuit) |  | 1 |
Derivative Lawsuit Against Officers and Directors |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed (lawsuit) |  | 3 |
Derivative Lawsuit Filed in District Court of Harris County, Texas |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed (lawsuit) |  | 2 | 1

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