Inventories - Additional information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Inventories:
Provision for inventory write-downs	$ 20,600	$ 2,500	$ 23,214	$ 6,054