Restructuring Costs - Changes in Restructuring Balance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Accrued restructuring, beginning balance			$ 0
Additional accruals	$ 43	$ 0	335	$ 0
Cash payments			(282)
Non-cash settlements			(34)
Accrued restructuring, ending balance	19		19
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrued restructuring, beginning balance			0
Additional accruals			301
Cash payments			(282)
Non-cash settlements			0
Accrued restructuring, ending balance	19		19
Asset Impairments
Restructuring Reserve [Roll Forward]
Accrued restructuring, beginning balance			0
Additional accruals			34
Cash payments			0
Non-cash settlements			(34)
Accrued restructuring, ending balance	$ 0		$ 0