Organization and Operations - Additional Information (Detail) $ / shares in Units, $ in Thousands						1 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) shares	Feb. 13, 2020 USD ($) shares	Feb. 11, 2020 USD ($) $ / shares shares	Mar. 08, 2019 TargetIndication	Jul. 01, 2015 TargetIndication	Jun. 30, 2015 TargetIndication shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares
Summary Of Organization And Operations [Line Items]
Common stock, shares issued | shares	25,813,000		6,500,000				25,813,000	18,226,000
Common stock, share price | $ / shares			$ 5.00
Aggregate proceeds received			$ 32,500				$ 34,811
Accumulated deficit	$ (181,440)						(181,440)	$ (135,548)
Cash and cash equivalents and liquid investments	80,500						80,500
Aggregate principal amount limit	25,000						$ 25,000
Aggregate loan amount received ,Net	$ 9,900
Underwritten Public Offering [Member]
Summary Of Organization And Operations [Line Items]
Common stock, shares issued | shares		975,000
Aggregate proceeds received		$ 4,900
Collaboration Agreement [Member] | BIOGEN [Member]
Summary Of Organization And Operations [Line Items]
Common stock, shares issued | shares						1,453,957
Number of target indications | TargetIndication				3	3	3