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Inventory
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Inventory
    Inventory consists of the following as of September 30, 2020 and December 31, 2019 (in thousands):
As of
September 30, 2020December 31, 2019
Raw materials$546 $412 
Work in process396 258 
Finished goods430 320 
Total$1,372 $990 
An inventory write-off of $112 thousand and $274 thousand was recorded for the three and nine months ended September 30, 2020, respectively. For the three and nine months ended September 30, 2019, no inventory write-off was recorded.