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Discontinued Operations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 3 Months Ended
Jan. 31, 2013
May 03, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from sale   $ 1,800
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)
Grass Technologies Product Group [Member]
    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from sale 18,600 1,800
Amount received from disposition of inventory   $ 2,355