Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2014
Long Lived Assets Held-for-sale [Line Items]        
Loss on disposal of property and equipment   $ 14 $ (21)  
Mundelein Facility | Level II        
Long Lived Assets Held-for-sale [Line Items]        
Asset held-for-sale book value       $ 3,600
Loss on disposal of property and equipment $ 2,200      
Asset held-for-sale at fair value   $ 1,400