Quarterly report pursuant to Section 13 or 15(d)

Inventory (Details)

v3.19.1
Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Inventory    
Inventory, Net, Total $ 14,952 $ 14,692
Inventory Current 6,232 1,840
Inventory, Noncurrent 8,720 12,852
Reduction in inventory valuation 1,964  
In Process Inventory [Member]    
Inventory    
Inventory, Net, Total   160
Plant Inventory [Member]    
Inventory    
Inventory, Net, Total 1,259 345
Conversion Facility Inventory [Member]    
Inventory    
Inventory, Net, Total $ 13,693 $ 14,187