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Commitments and Contingencies - Additional Information (Detail)
 6 Months Ended
Mar. 31, 2016
California [Member]  
Loss Contingencies [Line Items]  
Lease expiration date Mar. 31, 2017
Extension period available after expiration of lease 5 years
North Carolina [Member]  
Loss Contingencies [Line Items]  
Lease expiration date Nov. 30, 2015
Lease renewal period 3 months
Massachusetts [Member]  
Loss Contingencies [Line Items]  
Lease expiration date Nov. 30, 2015
Lease renewal period 1 year