Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 Floor
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 236	$ 533
Equipment Relocation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 200
Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		$ 500
Corvallis Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring, initiation date	2016-03
Restructuring, completion date	Mar. 31, 2017
Number of floors | Floor			2
Minimum lease payment obligation	$ 6,000
Corvallis Plan [Member] | Facility Closing [Member]
Restructuring Cost And Reserve [Line Items]
Number of floor closed | Floor			1