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(5) STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Operating expenses:        
Research and development $ 360 $ 73 $ 664 $ 148
General and administrative 655 33 1,129 197
Total stock-based compensation expense $ 1,015 $ 106 $ 1,793 $ 345
Impact on basic and diluted net loss per common share $ 0.01    $ 0.01 $ 0.01