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Accrued expenses and other current liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued expenses and other current liabilities    
Professional and consultant fees $ 441 $ 140
Compensation and related benefits 471 83
License and patent fees 87 108
Market research and consulting 40 40
Contract research organizations 127 15
Other expenses 45 13
Accrued expenses $ 1,211 $ 399