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Revenue - Disaggregated by Sales Channel (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue    
Revenue $ 37,503 $ 49,417
Distributor    
Disaggregation of Revenue    
Revenue 24,724 35,126
Non-distributor    
Disaggregation of Revenue    
Revenue $ 12,779 $ 14,291