Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Loss Contingencies [Line Items]
Purchase commitment period	150 days
Minimum future commitments	$ 15,400		$ 14,200
Recorded unconditional purchase obligation	500		400
Facility Closing [Member]
Loss Contingencies [Line Items]
Restructuring charges			166
Restructuring Reserve [Roll Forward]
Balance at January 1, 2017		$ 103	103
Cash payments made		(26)
Balance at March 31, 2017		$ 77
Employee Severance [Member]
Loss Contingencies [Line Items]
Restructuring charges			1,557
Restructuring Reserve [Roll Forward]
Balance at January 1, 2017	643
Cash payments made	(392)
Balance at March 31, 2017	$ 251		$ 643