CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (12,951)	$ (5,696)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	924	985
Stock-based compensation	9,894	2,276
Amortization of premium (accretion of discount) on investments in marketable debt securities	46	(730)
Non-cash operating lease expense	765
Revaluation of warrant liabilities		165
Changes in assets and liabilities:
Accounts receivable	(790)	707
Unbilled revenue	(376)	(621)
Prepaid expenses and other current assets	2,314	(1,142)
Other assets	(6,784)	(50)
Accounts payable	1,566	508
Accrued and other current liabilities	(4,504)	1,132
Operating lease liabilities	5,764
Other long-term liabilities	1,338	93
Deferred revenue	438	(7)
Net cash used in operating activities	(2,356)	(2,380)
Cash flows from investing activities:
Purchases of corporate and customer fund short-term investments	(343,345)	(189,204)
Proceeds from maturities of corporate and customer fund short-term investments	244,332	255,171
Proceeds from sale of corporate and customer fund short-term investments	33,286	10,761
(Increase) decrease in other receivables included in funds held for customers	(1,522)	2,049
Purchases of property and equipment	(5,894)	(1,946)
Capitalization of internal-use software costs	(314)	(215)
Net cash (used in) provided by investing activities	(73,457)	76,616
Cash flows from financing activities:
Increase in customer fund deposits liability	24,653	137,186
Proceeds from exercise of stock options	8,962	294
Proceeds from issuance of common stock under the employee stock purchase plan	4,327
Payments of offering costs related to the follow-on public offering	(664)
Payments of deferred offering costs		(874)
Payments of deferred debt issuance costs		(151)
Net cash provided by financing activities	37,278	136,455
Net (decrease) increase in cash, cash equivalents, restricted cash, and restricted cash equivalents	(38,535)	210,691
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of period	1,592,377	983,168
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period	1,553,842	1,193,859
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents within the consolidated balance sheets to the amounts shown in the consolidated statements of cash flows above:
Cash and cash equivalents	564,153	86,249
Restricted cash included in other current assets	$ 119	$ 256
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsCurrent	us-gaap:OtherAssetsCurrent
Restricted cash and restricted cash equivalents included in funds held for customers	$ 989,570	$ 1,107,354
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period	$ 1,553,842	$ 1,193,859