Commitments and Contingencies - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2015
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, 2014
Area occupied for office	122
Lease renew period	3 months
Massachusetts [Member]
Loss Contingencies [Line Items]
Lease expiration date	Nov. 30, 2015
Area occupied for office	670
Lease beginning date	Dec. 01, 2014
Lease renew period	1 year
Massachusetts [Member] | Sublease Agreement [Member]
Loss Contingencies [Line Items]
Lease expiration date	Jan. 15, 2015
Massachusetts [Member] | Predecessor [Member]
Loss Contingencies [Line Items]
Area occupied for office	2,565