Balance sheet information - Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Deposits and other assets	$ 1,225	$ 956
Non-marketable equity investments	6,670	458
Warrant to purchase non-marketable equity investment units	713	0
Non-marketable equity investments accounted for under the equity method	20,027	0
Non-marketable debt investments	5,917	0
Total other assets	$ 34,552	$ 1,414