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Product and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Breakdown of Product Net Sales
The following table provides a breakdown of product net sales for the years indicated (in thousands): 
 Year ended December 31,
 20202019
Commercial products$5,404 $7,877 
MMM products11,424 4,828 
Total net sales$16,828 $12,705 
Geographic Summary of Net Sales
A geographic summary of net sales is as follows (in thousands): 
 For the year ended December 31,
 20202019
United States$16,685 $12,599 
International143 106 
Total net sales$16,828 $12,705