Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 30, 2016
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 1,264	$ 2,423
Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Cost incurred related to workforce reduction	$ 1,000	$ 2,100
Corvallis Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring, initiation date		2016-03
Restructuring, estimated completion date		Dec. 30, 2016
Lease payment obligation		$ 4,300
Corvallis Plan [Member] | Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Percentage of workforce reduced		19.00%
Corvallis Plan [Member] | Workforce Reduction [Member] | Scenario, Forecast [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring expenses			$ 1,800
Cambridge Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring, initiation date		2016-08
Restructuring, estimated completion date		Oct. 31, 2016
Cambridge Plan [Member] | Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Percentage of workforce reduced		6.00%
Restructuring expenses		$ 700