Commitments and Contingencies - CRO contract (Detail)	Jun. 30, 2020 USD ($) person	Jan. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Commitments and Contingencies [Line Items]
Total	$ 6,772,000
Original Contract, Number Of Patients | person	724
Amended Contract, Number Of Patients | person	1,034
CRO
Commitments and Contingencies [Line Items]
Original contract	$ 6,180,000
Amendment to contract	4,075,000
Total Contract	10,255,000	$ 10,300,000	$ 6,200,000
Initial deposit (included in original contract amount)	861,000
Amendment to deposit	699,000
Expenses incurred applied to deposit	(1,344,000)
Remaining Deposit	216,000
Expenses incurred/accrued (includes expenses applied to deposit)	8,171,000
Total	$ 2,084,000