Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 340	$ 415
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	35,212,530	33,818,777
Common stock, shares outstanding	35,172,040	33,778,871
Treasury stock, common shares	40,490	39,906