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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventories    
Consumer products - finished goods $ 7,242 $ 4,877
Consumer Products - work in process 1,971 4,659
Bulk ingredients 1,194 1,364
Reference standards 624 635
Inventories $ 11,031 $ 11,535