Commitments and Contingencies (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended		12 Months Ended
	Apr. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Loss Contingencies [Line Items]
Purchase commitment period		150 days
Minimum future commitments		$ 13,700		$ 14,200
Recorded unconditional purchase obligation		600		400
Facility Closing [Member]
Loss Contingencies [Line Items]
Restructuring charges				200
Restructuring Reserve [Roll Forward]
Balance at January 1, 2017			$ 103	103
Cash payments made			(26)
Balance at June 30, 2017			$ 77
Employee Severance [Member]
Loss Contingencies [Line Items]
Restructuring charges				1,600
Restructuring Reserve [Roll Forward]
Balance at January 1, 2017		643
Cash payments made		(563)
Balance at June 30, 2017		$ 80		$ 643
Nestor Hilsenrat | Pending Litigation
Loss Contingencies [Line Items]
loss contingency, amount sought	$ 2,900