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Summary of Significant Accounting Policies - Revenue Recognition and Concentrations of Credit Risk - Additional Information (Detail) - Customer |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Concentration Risk [Line Items] |  |  |  |  |
Number of customers with an account receivable balance of more than 10% of total accounts receivable | 1 |  | 1 | 1 |
US federal corporate tax rate | 21.00% | 35.00% | 0.00% | 0.00% | 0.00%
Accounts Receivable [Member] | Customer [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Aggregate account receivable of more than 10% of total accounts receivable |  |  | 19.00% | 27.00% |

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