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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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- Definition

Number Of Customers With Accounts Receivable Balance Of More Than Stated Percentage Of Accounts Receivables

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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