Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended	6 Months Ended
	Dec. 06, 2023	Nov. 06, 2023	Oct. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Targeted or Tracking Stock, Stock [Line Items]
Unpaid common stock dividend		$ 1.75	$ 1.75	$ 1.75
Expenses related to an agreement			$ 1,100
Accumulated Losses Since Inception				$ (360,686)	$ (360,686)		$ (405,997)
Cash and cash equivalents and short term investments				$ 59,500	59,500
Closing agreement date		Nov. 17, 2023
Dividend paid	$ 11,700				$ 11,660	$ 0
Maximum
Targeted or Tracking Stock, Stock [Line Items]
Potential second return of capital			$ 9,330