Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Nov. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	Nov. 30, 2013 USD ($) item
Fiscal Year
Length of fiscal year		12 months
Number of quarters in 13 weeks period | item			4
Length of period for 4 quarters			91 days
Cash and Cash Equivalents
Money market funds invested in U.S. Treasury obligations	$ 15,269	$ 16,433
Impairment of Investments in Long Lived Assets
Impairment losses	0	$ 0	$ 0
Income Taxes
Accrual for uncertain income tax positions	$ 0
Minimum
Fiscal Year
Length of fiscal year			364 days
Maximum
Fiscal Year
Length of fiscal year			371 days