Fair Value Measurement - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Assets
Short-term investments	$ 123,974	$ 71,969
Funds held for customers	1,062,493	862,626
Total assets measured at fair value	1,206,542	948,313
Liabilities
Redeemable convertible preferred stock warrant liabilities		688
Total liabilities measured at fair value		688
Money Market Funds
Assets
Cash equivalents	20,075	13,718
U.S. Treasury Securities
Assets
Short-term investments	28,368	64,758
Funds held for customers	48,952	30,960
Corporate Bonds
Assets
Short-term investments	71,131	4,787
Funds held for customers	493,879	302,070
Asset-Backed Securities
Assets
Short-term investments	24,475	2,424
Restricted Cash Equivalents
Assets
Funds held for customers	433,709	424,219
Certificates of Deposit
Assets
Funds held for customers	85,953	105,377
Level 1
Assets
Short-term investments	28,368	64,758
Funds held for customers	406,302	455,179
Total assets measured at fair value	454,745	533,655
Level 1 | Money Market Funds
Assets
Cash equivalents	20,075	13,718
Level 1 | U.S. Treasury Securities
Assets
Short-term investments	28,368	64,758
Funds held for customers	48,952	30,960
Level 1 | Restricted Cash Equivalents
Assets
Funds held for customers	357,350	424,219
Level 2
Assets
Short-term investments	95,606	7,211
Funds held for customers	656,191	407,447
Total assets measured at fair value	751,797	414,658
Level 2 | Corporate Bonds
Assets
Short-term investments	71,131	4,787
Funds held for customers	493,879	302,070
Level 2 | Asset-Backed Securities
Assets
Short-term investments	24,475	2,424
Level 2 | Restricted Cash Equivalents
Assets
Funds held for customers	76,359
Level 2 | Certificates of Deposit
Assets
Funds held for customers	$ 85,953	105,377
Level 3
Liabilities
Redeemable convertible preferred stock warrant liabilities		688
Total liabilities measured at fair value		$ 688