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Nature of Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Nov. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Allowances Against Accounts Receivable
A summary of activity in the allowance for doubtful accounts is as follows (in thousands):
 
 
 
 
 
 
November 30, 2017
 
November 30, 2016
 
November 30, 2015
Beginning balance
$
741

 
$
1,421

 
$
1,646

Charge (credit) to costs and expenses
204

 
(256
)
 
271

Write-offs and other
(437
)
 
(370
)
 
(512
)
Translation adjustments
(10
)
 
(54
)
 
16

Ending balance
$
498

 
$
741

 
$
1,421
Schedule of Activity in Allowance for Sales Credit Memos
A summary of activity in the allowance for sales credit memos is as follows (in thousands):

 
 
 
 
 
November 30, 2017
 
November 30, 2016
 
November 30, 2015
Beginning balance
$
402

 
$
772

 
$
946

(Credit) charge to revenue
(158
)
 
(223
)
 
182

Write-offs and other
(69
)
 
(144
)
 
(332
)
Translation adjustments
3

 
(3
)
 
(24
)
Ending balance
$
178

 
$
402

 
$
772
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss by components, net of tax (in thousands):

 
Foreign Currency Translation Adjustment
 
Unrealized Gains (Losses) on investments
 
Total
Balance, December 1, 2015
$
(24,582
)
 
$
(46
)
 
$
(24,628
)
Other comprehensive loss before reclassifications
(3,843
)
 
(90
)
 
(3,933
)
Net other comprehensive loss
(3,843
)
 
(90
)
 
(3,933
)
Balance, December 1, 2016
$
(28,425
)
 
$
(136
)
 
$
(28,561
)
Other comprehensive income (loss) before reclassifications
9,655

 
(93
)
 
9,562

Net other comprehensive income (loss)
9,655

 
(93
)
 
9,562

Balance, November 30, 2017
$
(18,770
)
 
$
(229
)
 
$
(18,999
)