Annual report pursuant to Section 13 and 15(d)

Fair Value (Details 2)

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Fair Value (Details 2) (Preferred stock warrants, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2012
Preferred stock warrants
 
Roll forward of the fair value of the preferred stock warrants  
Balance at the beginning of the period, liabilities $ 1,027
Remeasurement 4,499
Exercise (3,374)
Conversion to common stock warrants $ (2,152)