Balance Sheet Components - Cash, Cash Equivalents, Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Cash and cash equivalents	$ 300,089	$ 210,533
Restricted cash included in prepaid expenses and other current assets	250	250
Restricted cash included in other assets	1,613	1,607
Total cash, cash equivalents and restricted cash	$ 301,952	$ 212,390	$ 252,622	$ 262,140