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2. Revenue (Details - Changes in Deferred Revenue) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]    
Deferred revenue, beginning balance $ 486  
New performance obligations 286  
Performance obligations assumed from acquisition of Maestro 178  
Recognition of revenue as a result of satisying performance obligations (346)  
Deferred revenue, ending balance 604  
Less: non-current portion of deferred revenue (159) $ (158)
Current portion ending balance $ 445 $ 328