Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data	Total USD ($)	Convertible Preferred Stock [Member] USD ($)	Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Accumulated Deficit [Member] USD ($)	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)
Balance, Beginning of Period at Jan. 31, 2011	$ (50,309)	$ 32,662		$ 13,546	$ (63,913)		$ 58
Balance, Beginning of Period, Shares at Jan. 31, 2011		55,232,073	524,274			32,502
Stock options exercised	23	16	1	22
Stock options exercised, Shares		151,166	5,356
Share-based compensation expense	636			636
Net (loss) income	14,138				14,138
Cumulative translation adjustments	(111)						(111)
Balance, End of Period at Jan. 31, 2012	(35,623)	32,678	1	14,204	(49,775)		(53)
Balance, End of Period, Shares at Jan. 31, 2012		55,383,239	529,630			32,502
Stock options and warrants exercised	85	7		85
Stock options and warrants exercised, Shares		58,000	94,052
Share-based compensation expense	924			924
Conversion of preferred stock into common stock upon initial public offering of common stock	32,685	(32,685)	8	32,677
Conversion of preferred stock into common stock upon initial public offering of common stock, Shares		(55,441,239)	8,529,366
Conversion of preferred stock into common stock warrants upon initial public offering of common stock	1,324			1,324
Issuance of common stock upon initial public offering	34,576		4	34,572
Issuance of common stock upon initial public offering, shares			4,166,667
Net (loss) income	763				763
Cumulative translation adjustments	37						37
Balance, End of Period at Jan. 31, 2013	34,771		13	83,786	(49,012)		(16)
Balance, End of Period, Shares at Jan. 31, 2013			13,319,715			32,502
Stock options exercised	205			205
Stock options exercised, Shares	73,167		68,997
Share-based compensation expense	1,210			1,210
Net (loss) income	(709)				(709)
Cumulative translation adjustments	56						56
Balance, End of Period at Jan. 31, 2014	$ 35,533		$ 13	$ 85,201	$ (49,721)		$ 40
Balance, End of Period, Shares at Jan. 31, 2014			13,388,712			32,502