Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies (Detail) - Computation of basic and diluted net loss per share

v2.4.0.6
Summary of significant accounting policies (Detail) - Computation of basic and diluted net loss per share (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Dec. 31, 2012
Jul. 31, 2012
Dec. 31, 2011
Jul. 31, 2011
Dec. 31, 2010
Jul. 31, 2010
Numerator:                            
Net loss (in Dollars) $ (27,143) $ (3,411) $ (4,221) $ (4,494) $ (4,020) $ (2,110) $ (5,708) $ (1,122) $ (39,269) $ (39,269) $ (12,960) $ (12,960) $ (22,233) $ (22,233)
Denominator:                            
Weighted-average common shares outstanding- Basic                 38,798   38,357   38,001  
Weighted-average common shares outstanding - Diluted                 38,798   38,357   38,001  
Net loss per share                            
Basic and diluted (in Dollars per share) $ (0.69) $ (0.09) $ (0.11) $ (0.12) $ (0.11) $ (0.05) $ (0.15) $ (0.03) $ (1.01) $ (1.01) $ (0.34) $ (0.34) $ (0.59) $ (0.59)