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2. Revenue (Details - Changes in Deferred Revenue) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]    
Deferred revenue, beginning balance $ 1,460  
New performance obligations 134  
Recognition of revenue as a result of satisying performance obligations (704)  
Deferred revenue, ending balance 890  
Less: non-current portion of deferred revenue (166) $ (166)
Current portion ending balance $ 724 $ 658