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Revenue - Disaggregated by Sales Channel (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue    
Revenue $ 10,108 $ 10,026
Distributor    
Disaggregation of Revenue    
Revenue 6,990 7,185
Non-distributor    
Disaggregation of Revenue    
Revenue $ 3,118 $ 2,841