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Balance Sheet Components - Future amortization expense of intangible assets (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Balance Sheet Related Disclosures [Abstract]  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 925
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3,360
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3,360
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,286
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,249
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2,433
Intangible assets, net $ 16,613