Commitments and Contingencies - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2018 USD ($) ft² Renewal_Options
Commitments and Contingencies [Line Items]
Irrevocable standby letter of credit | $	$ 150,000
Watertown [Member]
Commitments and Contingencies [Line Items]
Area of leased office and laboratory space	13,650
Lease term expiration date	Apr. 30, 2019
Lease renewal option period	5 years
Liberty Corner [Member]
Commitments and Contingencies [Line Items]
Lease term expiration date	Jun. 30, 2022
Lease renewal option period	5 years
Area of leased office space	3,000
Number of renewal options | Renewal_Options	2
Lease renewal rate at 95% of market rent at time of renewal	95.00%