Stockholder's Equity (Deficit) - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended				0 Months Ended
	Jul. 03, 2012	Jun. 08, 2012	Jan. 31, 2014	Jan. 31, 2013	Jun. 08, 2012 Reverse Stock Split [Member]	Jul. 03, 2012 Initial Public Offering [Member]	Jan. 31, 2012 Initial Public Offering [Member]
Stockholders Equity Note Disclosure [Line Items]
Common stock issued						4,166,667
Common stock issuance, per share						$ 10.00
Net proceeds from common stock issued						$ 34,576
Underwriting discounts and commissions	2,917					2,917
Common stock issued, offering expenses						4,157
Deferred offering expenses							$ 2,315
Preferred stock conversion rate						Upon the closing of the initial public offering, each share of the Company's preferred stock was converted into two thirteenths of a share of the Company's common stock.
Common stock, reverse stock split		1-for-6.5			1-for 6.5
Common stock par value			$ 0.001	$ 0.001	$ 0.001