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2. Revenue (Details - Changes in Deferred Revenue) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]    
Deferred revenue, beginning balance $ 1,460  
New performance obligations 356  
Recognition of revenue as a result of satisying performance obligations (912)  
Deferred revenue, ending balance 904  
Less: non-current portion of deferred revenue (163) $ (166)
Current portion ending balance $ 741 $ 658