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Revenue - Major Products (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Revenue from External Customer [Line Items]                      
Revenue, net $ 59,368 $ 56,077 $ 61,242 $ 56,228 $ 56,170 $ 56,012 $ 58,167 $ 55,609 $ 232,915 $ 225,958 $ 203,204
Concentration risk, percentage (in percent)                 100.00% 100.00% 100.00%
Protandim® product line                      
Revenue from External Customer [Line Items]                      
Revenue, net                 $ 156,335 $ 144,100 $ 130,094
Concentration risk, percentage (in percent)                 67.10% 63.80% 64.00%
TrueScience® product line                      
Revenue from External Customer [Line Items]                      
Revenue, net                 $ 23,739 $ 24,853 $ 20,881
Concentration risk, percentage (in percent)                 10.20% 11.00% 10.30%
Other                      
Revenue from External Customer [Line Items]                      
Revenue, net                 $ 52,841 $ 57,005 $ 52,229
Concentration risk, percentage (in percent)                 22.70% 25.20% 25.70%