Commitments and Contingencies - Additional Information (Detail)		1 Months Ended		3 Months Ended
	Apr. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) ft²
Commitments and Contingencies [Line Items]
Irrevocable standby letter of credit				$ 150,000
Accrued expenses			$ 3,583,000	3,688,000
Alimera [Member]
Commitments and Contingencies [Line Items]
Under-reported net profit share for 2014 based on independent audit findings	$ 136,000
Payment received based on audit findings and reimbursement of audit costs			354,000
Amount received for reimbursement of audit costs			204,000
Refund claim submitted to arbitration by Alimera		$ 354,000
Receipt of under-reported net profits recorded as deferred revenue pending dispute resolution			136,000	136,000
Accrued expenses			$ 218,000	$ 218,000
Watertown [Member]
Commitments and Contingencies [Line Items]
Area of leased office and laboratory space | ft²				13,650
Lease term expiration date				Apr. 30, 2019
Lease renewal option period				5 years
Malvern, U.K. [Member]
Commitments and Contingencies [Line Items]
Area of leased office and laboratory space | ft²				2,200
Lease term expiration date				Nov. 30, 2016