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Inventory
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Inventory
        Inventory consists of the following as of June 30, 2020 and December 31, 2019 (in thousands):
As of
June 30, 2020December 31, 2019
Raw materials$586  $412  
Work in process548  258  
Finished goods208  320  
Total$1,342  $990  
An inventory write-off of zero and $162 thousand was recorded for the three and six months ended June 30, 2020, respectively. For the three and six months ended June 30, 2019, no inventory write-off was recorded.