Annual report pursuant to section 13 and 15(d)

Changes in Inventory Reserves (Detail)

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Changes in Inventory Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventory [Line Items]      
Inventory reserve at January 1, $ 1,669 $ 895 $ 271
Additions 1,190 1,346 628
Write offs (1,605) (572) (4)
Inventory Reserve at December 31, $ 1,254 $ 1,669 $ 895