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Inventory (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consists of the following as of the dates presented (in thousands):
December 31,
March 31, 202120202019
Raw materials$626 $633 $412 
Work in process1,054 350 258 
Finished goods543 644 320 
Total$2,223 $1,627 $990