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Certain Balance Sheet Accounts - Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]    
Contract Research $ 922 $ 1,447
Legal 779 323
Employee Compensation 605 458
Clinical Trials 174 1,842
Consulting & Professional Fees 373 252
Other Accruals 1,309 435
Accrued Expenses $ 4,162 $ 4,757