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Balance Sheet Components - Intangible Assets, Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Payments to Acquire Intangible Assets $ 405 $ 14,034
STMicro | License fees    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Net $ 16,200