Discontinued Operations - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2013	May 03, 2014	Aug. 02, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale			$ 1,800,000
Period of transition services and manufacturing, Maximum			12 months
Transition Service Agreement expiration date			Jan. 31, 2014
Amount received from disposition of inventory			(2,355,000)
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	18,600,000		1,800,000
Amount received from disposition of inventory		$ 2,355,000