v2.4.0.8
Net income per share attributable to common stockholders (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Earnings Per Share [Abstract]        
Net income $ 3,049 $ 1,978 $ 8,795 $ 5,950
Add back (deduction): accretion of redeemable convertible preferred stock 0 (245) 4,021 (925)
Less: dividend on redeemable convertible preferred stock and dividend on convertible preferred stock (21) (650) (1,286) (1,951)
Less: undistributed income attributed to redeemable convertible preferred stockholders (8) (476) (1,285) (1,357)
Net income attributable to common stockholders for basic earnings per share 3,020 607 10,245 1,717
Add back: dividend of redeemable convertible preferred stock 15 241 1,286 723
Add back (deduction): accretion on redeemable convertible preferred stock and dividend on convertible preferred stock 0 75 (4,021) 284
Add back: series D-3 derivative liability revaluations 0 0 735 0
Add back: adjustment to undistributed income attributed to redeemable convertible preferred stockholders 1 290 1,285 796
Net income attributable to common stockholders for diluted earnings per share $ 3,036 $ 1,213 $ 9,530 $ 3,520
Weighted-average common shares outstanding (in shares) 53,678 5,582 23,232 5,548
Weighted-average dilutive effect of stock options (in shares) 2,944 1,156 3,290 1,168
Weighted-average dilutive effect of common shares from stock warrants (in shares) 3 2,579 1,634 2,581
Dilutive effect from preferred stock assuming conversion (in shares) 928 19,408 21,896 19,408
Weighted-average common shares outstanding (in shares) 57,553 28,725 50,052 28,705
Basic (in dollars per share) $ 0.06 $ 0.11 $ 0.44 $ 0.31
Diluted (in dollars per share) $ 0.05 $ 0.04 $ 0.19 $ 0.12