Commitment - Additional Information (Detail)			9 Months Ended
	Oct. 27, 2015	Oct. 26, 2015	Sep. 30, 2015
Commitment And Contingencies [Line Items]
Lease amendment date			Oct. 27, 2015
Subsequent Event [Member]
Commitment And Contingencies [Line Items]
Lease termination date	Dec. 31, 2020	Dec. 31, 2016