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Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]    
Payroll and payroll-related expenses $ 2,065 $ 1,120
Research and development expenses 10 [1] 1,132 [1]
All other 3,149 1,781
Accrued expenses and other liabilities $ 5,224 $ 4,033
[1] Research and development accruals are based on the timing of clinical trial activities and related progress payments.