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Inventory - Components of Inventory (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Dec. 12, 2018
Inventory Disclosure [Abstract]      
Raw materials $ 1,744,000 $ 1,880,000  
Work in process 198,961,000 215,122,000  
Finished goods 27,900,000 18,182,000  
Total inventory 228,605,000 235,184,000  
Inventory 115,206,000 114,245,000 $ 0
Other assets $ 113,399,000 $ 120,939,000