Restructuring and Severance - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost And Reserve [Line Items]
Restructuring and severance	$ 160	$ 215	$ 3,100	$ 408
Facility Closing
Restructuring Cost And Reserve [Line Items]
Restructuring and severance	100
Employee Severance
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 100
General and Administrative Expense
Restructuring Cost And Reserve [Line Items]
Severance costs				$ 100