Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail)

v2.4.1.9
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Segment Reporting Information [Line Items]    
Total revenues $ 23,177us-gaap_SalesRevenueNet $ 24,337us-gaap_SalesRevenueNet
United States Revenue [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 11,935us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US 		$ 13,468us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
Customer Concentration Risk [Member] | United States Revenue [Member] | Total Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 51.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_US 		55.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_US