Commitments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 28, 2011
Commitments and Contingencies Disclosure [Abstract]
Capital Lease agreement expiry date	2022-01
Portion of leases in fixed assets	$ 1,300
Portion of leases in accumulated depreciation	$ 827
Operating lease agreement expiry date	Dec. 31, 2020
Operating leases rent expense	$ 1,600	$ 1,100
Lease term	November 2011 through December 2018
Leasehold improvement liability			$ 613
Unamortized balance of lease	$ 182
Purchase which is not recorded on Company's Balance Sheet	$ 782