Revenue, Performance Obligations, Deferred Revenue and Deferred Costs - Schedule of Subscription and Transaction Fees Disaggregated by Customer Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 59,738	$ 41,230	$ 159,992	$ 115,490
Subscription and Transaction Fees
Disaggregation Of Revenue [Line Items]
Total revenue	58,622	36,092	154,743	97,604
Subscription and Transaction Fees | Small-to-midsize Business and Accounting Firm Customers
Disaggregation Of Revenue [Line Items]
Total revenue	54,710	33,356	144,609	89,789
Subscription and Transaction Fees | Financial Institution Customers
Disaggregation Of Revenue [Line Items]
Total revenue	$ 3,912	$ 2,736	$ 10,134	$ 7,815