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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Inventory      
Raw materials $ 5,011   $ 3,514
Work in process 802   1,096
Finished goods 9,685   11,004
Total inventory 15,498   $ 15,614
Inventory used in the construction and installation of property and equipment $ 516 $ 394