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Balance Sheet - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Oct. 31, 2013
Customer
Jan. 31, 2013
Balance Sheet [Line Items]    
Contracts receivable $ 858 $ 904
Contracts receivable, Interest rate 8.70%  
Notes receivable relate to promissory notes $ 269 $ 1,471
Number of customers 2  
Maximum [Member]
   
Balance Sheet [Line Items]    
Contracts receivable repayment term 11 months  
Minimum [Member]
   
Balance Sheet [Line Items]    
Contracts receivable repayment term 5 months