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ACCRUED AND OTHER CURRENT LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
ACCRUED AND OTHER CURRENT LIABILITIES    
Accrued research and development $ 2,777 $ 3,623
Accrued legal and professional fees 396 1,118
Other current liabilities 361 860
Total $ 3,534 $ 5,601