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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventories    
Work-in-process $ 98,255 $ 104,139
Finished goods, net 19,589 20,433
Total inventories 117,844 124,572
Inventories, net 30,577 26,519
Long-term inventory 87,267 $ 98,053
Cash deposit on non-current inventory made to a manufacturer $ 24,700