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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Components of inventories      
Raw materials   $ 10,225 $ 13,698
Work in process   3,740 2,489
Finished goods   11,352 6,755
Inventories, net   $ 25,317 $ 22,942
Inventory reserve $ 2,100