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Balance Sheet Components - Intangible assets (Details) - USD ($)
 12 Months Ended
Sep. 05, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]        
Payments to Acquire Intangible Assets   $ 405,000 $ 16,384,000 $ 0
Intangible assets, gross   19,455,000 19,051,000  
Less accumulated amortization   (2,842,000) (2,729,000)  
Intangible Assets, Net (Excluding Goodwill)   16,613,000 16,322,000  
Goodwill   269,000 269,000 300,000
Intangible assets, net   16,882,000 16,591,000  
Amortization expense   113,000 76,000 $ 0
Patents and exclusive technology rights [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross   18,037,000 17,633,000  
Trade name [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross   268,000 268,000  
Customer relationships [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross   1,150,000 $ 1,150,000  
STMicro [Member] | Licensing Agreements [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Payments to Acquire Intangible Assets $ 17,000,000 $ 16,200,000    
Payments to Acquire Intangible Assets in Calender year 2017 10,100,000      
Payments to Acquire Intangible Assets in Calender Year 2018 6,700,000      
Payments to Acquire Intangible Assets in Calendar Year 2019 $ 200,000