Geographical Information - Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue, Major Customer
Total revenue	$ 35,604	$ 50,693	$ 72,576	$ 97,881
United States
Revenue, Major Customer
Total revenue			67,163	75,891
Foreign
Revenue, Major Customer
Total revenue			$ 5,413	$ 21,990