Stock-Based Compensation - Additional Information (Detail)	0 Months Ended
	Jun. 12, 2013	Jun. 06, 2012	Sep. 30, 2014	Jun. 12, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance			17,600,000
2008 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares of common stock authorized for issuance	6,000,000	3,000,000
Maximum number of shares of common stock authorized for issuance				19,540,940
Number of shares available for future issuance			5,600,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares of common stock authorized for issuance		500,000
Number of shares available for future issuance			400,000