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Accounts Payable and Accrued Liabilities - Summary of Accounts Payable and Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Accounts payable $ 3,022 $ 3,046
Accrued clinical trial expense 727 615
Accrued professional fees 510 238
Deferred rent 121 94
Other    20
Total accounts payable and accrued liabilities $ 4,380 $ 4,013