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Commitments and Contingencies (Details) - lawsuit | 1 Months Ended | 8 Months Ended
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Jan. 31, 2016 | Nov. 30, 2015 | Sep. 30, 2016
Punitive Lawsuits Filed in the United States District Court for the Southern District of Texas |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed | 1 | 4 |
Derivative Lawsuit Against Officers and Directors |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed | 3 |  |
Derivative Lawsuit Filed in District Court of Harris County, Texas |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed | 2 |  | 1

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