Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Accrual reversals	$ (20)	$ 947
Cash payments	(203)	$ (235)
Accrued restructuring balance as of March 31, 2017	62
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Accrued restructuring balance as of December 31, 2016	285
Accrual reversals	(20)
Cash payments	(203)
Accrued restructuring balance as of March 31, 2017	$ 62