Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	$ 1,736
Restructuring charges	37
Cash payments	(420)
Accrued expense ending balance	1,353
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	611
Restructuring charges	32
Cash payments	(281)
Non-cash write-offs and other adjustments	8
Accrued expense ending balance	370
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	1,111
Cash payments	(125)
Non-cash write-offs and other adjustments	(8)
Accrued expense ending balance	978
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	14
Restructuring charges	5
Cash payments	(14)
Accrued expense ending balance	$ 5