Consolidated Balance Sheets (Parenthetical) - $ / shares	Jan. 31, 2017	Jan. 31, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	14,926,429	14,663,621
Common stock, shares outstanding	14,893,927	14,631,119
Treasury stock, shares	32,502	32,502