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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Partnership Organization And Basis Of Presentation [Line Items]      
Lease period One year or less    
Services pursuant to contracts term 12 months    
Support services term 12 months    
Additional charges $ 0    
Contracts receivable term Less than two years    
Liquid investments maturity period Three months or less    
Salvage value assigned to property and equipment 0    
Impairment charges related to long-lived assets 0 0 0
Customers warranty against defects 3 years    
Warranty expense amounted to approximately $ 0 $ 61,000 $ 3,000
Anti-dilutive weighted shares of potential common stock 501,000 296,000 339,000
Covenants Not To Compete [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Intangible Assets Amortization Period 3 years    
Building [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Estimated useful lives 30 years    
Property Improvements [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Estimated useful lives 10 years    
Minimum [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Short-term investments maturity period Three months    
Estimated useful lives 3 years    
Minimum [Member] | Proprietary Rights [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Intangible Assets Amortization Period 12 years 6 months    
Minimum [Member] | Channel Boxes [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Estimated useful lives 5 years    
Minimum [Member] | Peripheral Equipment [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Estimated useful lives 2 years    
Maximum [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Short-term investments maturity period Twelve months    
Estimated useful lives 7 years    
Maximum [Member] | Proprietary Rights [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Intangible Assets Amortization Period 15 years    
Maximum [Member] | Channel Boxes [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Estimated useful lives 7 years    
Maximum [Member] | Peripheral Equipment [Member]
      
Partnership Organization And Basis Of Presentation [Line Items]      
Estimated useful lives 10 years