Restructuring Activities - Summary of Charges Related to Restructuring Activities (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Restructuring Cost And Reserve [Line Items]
Expenses	$ 809	$ 809
Accrued restructuring expenses	809	809
Severance Benefits and Related Costs Due to Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Expenses		809
Accrued restructuring expenses	$ 809	$ 809