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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Inventory      
Raw materials $ 5,626   $ 795
Work in process 1,685   1,427
Finished goods 8,652   7,421
Total inventory 15,963   $ 9,643
Inventory used in the construction and installation of property and equipment $ 394 $ 0