Commitments and Contingencies - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2017 USD ($) € / $	Mar. 31, 2017 EUR (€)
Commitments And Contingencies [Line Items]
License agreement commencement date	2006-03	2006-03
Annual minimum payments for licenses	$ 215,000	€ 200,000
Exchange rate relating to license payment | € / $	1.0736
Future minimum payments associated with license | $	$ 2,700,000
Patents [Member]
Commitments And Contingencies [Line Items]
Patent expiry date	2027-09	2027-09