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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Inventory      
Raw materials $ 5,153 $ 5,153 $ 795
Work in process 2,643 2,643 1,427
Finished goods 11,019 11,019 7,421
Total inventory 18,815 18,815 $ 9,643
Inventory used in the construction and installation of property and equipment $ 219 $ 613