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Commitments and Contingencies - Additional Information (Detail) (USD $)			3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013 California [Member]	Dec. 31, 2013 Massachusetts [Member]
Loss Contingencies [Line Items]
Lease expires date			Mar. 31, 2017	Jan. 15, 2015
Extension period available after expiration of lease			5 years
Commitments or contingencies

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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