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Balance Sheet Components - Intangible Assets, Additional Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Sep. 05, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Payments to Acquire Intangible Assets |  | $ 14,034 | $ 0
STMicro | License fees |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Payments to Acquire Intangible Assets | $ 17,000 | 13,500 |
Payments to Acquire Intangible Assets in Calender Year 2017 | 10,100 |  |
Payments to Acquire Intangible Assets in Calender Year 2018 | 6,700 |  |
Payments to Acquire Intangible Assets in Calender Year 2019 | $ 200 |  |
Finite-Lived Intangible Assets, Net |  | $ 16,400 |

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