CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Follow-On Public Offering	Common Stock	Common Stock Follow-On Public Offering	Additional Paid-in Capital	Additional Paid-in Capital Follow-On Public Offering	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Redeemable Convertible Preferred Stock
Beginning balance at Jun. 30, 2017	$ (96,832)		$ 1		$ 6,314			$ (103,147)
Beginning balance, shares at Jun. 30, 2017									41,408,000
Beginning balance at Jun. 30, 2017									$ 135,342
Beginning balance, shares at Jun. 30, 2017			6,969,000
Issuance of Series G and H redeemable convertible preferred stock, net of issuance costs									$ 55,805
Issuance of Series G and H redeemable convertible preferred stock, net of issuance costs (in shares)									5,723,000
Issuance of common stock upon exercise of stock options	755				755
Issuance of common stock upon exercise of stock options, shares			376,000
Employee stock-based compensation	1,545				1,545
Other comprehensive income (loss), net of tax	(177)						$ (177)
Net loss	(7,195)							(7,195)
Ending balance at Jun. 30, 2018	(101,904)		$ 1		8,614		(177)	(110,342)
Ending balance, shares at Jun. 30, 2018									47,131,000
Ending balance at Jun. 30, 2018									$ 191,147
Ending balance, shares at Jun. 30, 2018			7,345,000
Issuance of Series G and H redeemable convertible preferred stock, net of issuance costs									$ 85,160
Issuance of Series G and H redeemable convertible preferred stock, net of issuance costs (in shares)									5,304,000
Issuance of common stock upon exercise of stock options	1,702				1,702
Issuance of common stock upon exercise of stock options, shares			809,000
Employee stock-based compensation	4,082				4,082
Issuance of stock warrants	274				274
Other comprehensive income (loss), net of tax	503						503
Net loss	(7,314)							(7,314)
Ending balance at Jun. 30, 2019	$ (102,657)		$ 1		14,672		326	(117,656)
Ending balance, shares at Jun. 30, 2019	52,435,000								52,435,000
Ending balance at Jun. 30, 2019	$ 276,307								$ 276,307
Ending balance, shares at Jun. 30, 2019			8,154,000
Conversion of redeemable convertible preferred stock to common stock upon initial public offering	276,307		$ 1		276,306
Conversion of redeemable convertible preferred stock to common stock upon initial public offering, shares									(52,435,000)
Conversion of redeemable convertible preferred stock to common stock upon initial public offering									$ (276,307)
Conversion of redeemable convertible preferred stock to common stock upon initial public offering, shares			52,435,000
Reclassification of redeemable convertible preferred stock warrant liabilities to additional paid-in capital upon initial public offering	1,405				1,405
Issuance of common stock upon public offering, net of underwriting discounts and commissions and other offering costs	225,481	$ 307,512			225,481	$ 307,512
Issuance of common stock upon public offering, net of underwriting discounts and commissions and other offering costs, shares			11,297,000	4,330,000
Issuance of common stock upon exercise of stock options	$ 13,460				13,460
Issuance of common stock upon exercise of stock options, shares	3,291,000		3,298,000
Issuance of common stock upon exercise of stock warrants	$ 144				144
Issuance of common stock upon exercise of stock warrants, shares			121,000
Employee stock-based compensation	18,064				18,064
Other comprehensive income (loss), net of tax	2,094						2,094
Net loss	(31,091)							(31,091)
Ending balance at Jun. 30, 2020	$ 710,719		$ 2		$ 857,044		$ 2,420	$ (148,747)
Ending balance, shares at Jun. 30, 2020	0
Ending balance, shares at Jun. 30, 2020			79,635,000