Commitments and Contingencies - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2015 EUR (€)	Mar. 31, 2015 January 2009 through September 2014 [Member] USD ($)	Mar. 31, 2015 Patents [Member]
Commitments and Contingencies [Line Items]
Hydrophilic coating royalties overpaid			$ 5,700,000
Additional shares of common stock to stockholders	480,059	480,059
License agreement commencement date	2006-03	2006-03
Annual minimum payments for licenses	217,000	200,000
Exchange rate relating to license payment	1.08501	1.08501
Future minimum payments associated with license	$ 2,700,000
Patent expiry date				2027-09