v2.4.0.8

Common stock warrants (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified					9 Months Ended
	Oct. 31, 2014	Jan. 31, 2014	Jan. 31, 2014 Series A Convertible Preferred Stock, Exercisable Through November 2015	Nov. 30, 2005 Series A Convertible Preferred Stock, Exercisable Through November 2015	Oct. 31, 2014 Series B Convertible Preferred Stock, Exercisable Through February 2014	Jan. 31, 2014 Series B Convertible Preferred Stock, Exercisable Through February 2014	Feb. 29, 2004 Series B Convertible Preferred Stock, Exercisable Through February 2014	Jan. 31, 2014 Series B Convertible Preferred Stock, Exercisable Through Sept 2015	Sep. 30, 2005 Series B Convertible Preferred Stock, Exercisable Through Sept 2015	Jan. 31, 2014 Series C Redeemable Convertible Preferred Stock, Exercisable Through August 2016	Aug. 31, 2006 Series C Redeemable Convertible Preferred Stock, Exercisable Through August 2016	Jan. 31, 2014 Series C Redeemable Convertible Preferred Stock, Exercisable Through May 7, 2015	May 07, 2007 Series C Redeemable Convertible Preferred Stock, Exercisable Through May 7, 2015	Jan. 31, 2014 Series D1 Redeemable Convertible Preferred Stock, Exercisable Through 2016	Aug. 31, 2008 Series D1 Redeemable Convertible Preferred Stock, Exercisable Through 2016	Oct. 31, 2014 Series D3 Redeemable Convertible Preferred Stock, Exercisable Through August 2021	Jan. 31, 2014 Series D3 Redeemable Convertible Preferred Stock, Exercisable Through August 2021	Aug. 31, 2011 Series D3 Redeemable Convertible Preferred Stock, Exercisable Through August 2021
Class of Warrant or Right [Line Items]
Number of securities called by warrants				150			400		200		600		1,000		400			966
Exercise price of warrants (usd per share)	$ 0.8008			$ 1.00			$ 1.00		$ 1.00		$ 1.50		$ 0.01		$ 2.00			$ 0.01
Warrants exercised			26		340	50		5		10		4					767
Warrants forfeited					10
Warrants outstanding			124			350		195		590		1,000		400		199
Value of common stock warrants	$ 0	$ 2,334		$ 51			$ 44		$ 66		$ 339		$ 1,600					$ 1,700

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Number of warrants or rights outstanding.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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