Number of shares authorized for issuance under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Subsequent Events - Additional Information (Detail) - $ / shares			9 Months Ended	12 Months Ended
	Aug. 31, 2019	Jul. 31, 2019	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2018
Subsequent Event [Line Items]
Exercise price			$ 15.12	$ 8.30	$ 4.17
Subsequent Event [Member] \| Two Thousand Sixteen Equity Incentive Plan [Member]
Subsequent Event [Line Items]
Options granted to purchase	575,747	965,993
Exercise price	$ 13.40	$ 13.40