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Accrued Wind-down Expenses - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Aug. 01, 2016 Employees
Restructuring and Related Activities [Abstract]
Number of impacted employees due to work force reduction | Employees			50
Total wind-down expense	$ 2,694	$ 3,806,142
Total accrued wind-down expense	$ 80,000	$ 80,000

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