Stock-Based Compensation - Employee Stock Purchase Plan ("ESPP") - Additional Information (Detail) (Employee Stock Purchase Plan ("ESPP") [Member], USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended				9 Months Ended
	Aug. 31, 2014	Feb. 28, 2014	Aug. 31, 2013	Feb. 28, 2013	Sep. 30, 2014	Jun. 30, 2014
Employee Stock Purchase Plan ("ESPP") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value to determine purchase price					85.00%
Offering period					9 months
Proceeds of from issuance of shares under ESPP	$ 0.3	$ 0.3	$ 0.3	$ 0.3
Options issued	51,545	49,063	51,735	61,230
Rate of discount on fair market value of common stock under ESPP					15.00%
Period of expected life, options granted					5 years
Increase number authorized shares						750,000