Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

v3.10.0.1
Fair Value Measurements - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Aug. 06, 2018
USD ($)
Jun. 30, 2018
USD ($)
a
Long Lived Assets Held-for-sale [Line Items]        
Loss on disposal of property and equipment $ 410 $ 14    
Mundelein Facility | Level II        
Long Lived Assets Held-for-sale [Line Items]        
Asset held-for-sale at fair value     $ 1,200  
Land | Level II        
Long Lived Assets Held-for-sale [Line Items]        
Area of land held for sale | a       1.5
Asset held-for-sale at fair value       $ 900