Quarterly report pursuant to Section 13 or 15(d)

Acquisition Obligation (Details)

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Acquisition Obligation (Details)
Jan. 31, 2016
USD ($)
item
shares
Jan. 31, 2015
USD ($)
Mar. 24, 2012
shares
Sep. 28, 2011
shares
Mar. 24, 2011
USD ($)
Acquisition obligation          
Number of amendments | item 2        
Class of warrant (in shares) 3,073,675        
Amount of the obligation under the agreement | $ $ 0 $ 0     $ 3,000,000
First Amendment          
Acquisition obligation          
Class of warrant (in shares)       50,000  
Second Amendment          
Acquisition obligation          
Class of warrant (in shares)     150,000