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Summary of Significant Accounting Policies - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Net [Abstract]    
Raw materials $ 6,894 $ 6,700
Work in process 1,074 833
Finished goods 5,261 3,911
Inventories $ 13,229 $ 11,444