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Inventory (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 3,950 $ 4,961
Work in process 0 490
Finished goods 1,207 759
Total inventories $ 5,157 $ 6,210
Finished goods shelf life 36 months