Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Fiscal Year
Length of fiscal year	12 months
Cash and Cash Equivalents
Money market funds invested in U.S. Treasury obligations	$ 22,409	$ 15,269
Impairment of Investments in Long Lived Assets
Impairment losses	0	$ 0	$ 0
Income Taxes
Accrual for uncertain income tax positions	$ 0

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant