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Inventory (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consists of the following as of December 31, 2019 and 2018 (in thousands):

As of December 31,
20192018
Raw materials$412 $258 
Work in process258 270 
Finished goods320 324 
Total$990 $852