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ACCRUED AND OTHER CURRENT LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accrued and Other Current Liabilities    
Accrued research and development $ 3,218 $ 3,565
Accrued legal and professional fees 244 265
Other current liabilities 349 842
Total $ 3,811 $ 4,672