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2. Revenue (Details - Changes in Deferred Revenue) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]    
Deferred revenue, beginning balance $ 1,460  
New performance obligations 580  
Recognition of revenue as a result of satisying performance obligations (1,065)  
Deferred revenue, ending balance 975  
Less: non-current portion of deferred revenue (187) $ (166)
Current portion ending balance $ 788 $ 658