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Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):
June 30,
2020
December 31,
2019
Raw materials$3,456  $4,093  
Work in process649  —  
Finished goods1,801  1,230  
Total inventories$5,906  $5,323