Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		$ 1,882		$ 231
Restructuring charges		4,929	[1]	5,840
Reserves reversed		(322)
Cash payments		(4,181)		(3,126)
Non-cash write-offs and other adjustments		(572)		(1,063)
Accrued expense ending balance		1,736		1,882
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		1,358		102
Restructuring charges		2,738	[1]	3,918
Reserves reversed		(322)
Cash payments		(3,170)		(2,668)
Non-cash write-offs and other adjustments		7		6
Accrued expense ending balance		611		1,358
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		406		108
Restructuring charges		777	[1]	441
Cash payments		(104)		(156)
Non-cash write-offs and other adjustments		32		13
Accrued expense ending balance		1,111		406
Depreciation
Restructuring Cost And Reserve [Line Items]
Restructuring charges		616	[1]	1,082
Non-cash write-offs and other adjustments		(616)		(1,082)
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	[2]	118		21
Restructuring charges	[2]	798	[1]	399
Cash payments	[2]	(907)		(302)
Non-cash write-offs and other adjustments	[2]	5
Accrued expense ending balance	[2]	$ 14		$ 118

[1] Excludes $1.6 million of gain on sale of the Chatsworth, California facility.

[2] Other restructuring charges mainly related to consulting fees and relocation costs.