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Accrued Expenses - Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accrued Liabilities Current [Abstract]    
Accrued compensation and benefits $ 9,135 $ 10,080
Accrued sales and marketing costs 5,269 3,402
Accrued legal contingency 3,174  
Accrued rent obligations 1,787 1,103
Accrued manufacturing expenses 1,107 1,350
Other 2,823 2,883
Total accrued expenses $ 23,295 $ 18,818