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Revenue Recognition (Details) - USD ($)
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Total net revenue $ 1,440,000 $ 1,432,000
U.S.    
Total net revenue 1,262,000 1,273,000
Rest-of-the-World    
Total net revenue $ 178,000 $ 159,000