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Condensed Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Operating Expense [Member]        
Share-based Compensation $ 1,452 $ 658 $ 3,726 $ 1,905
Research and Development Expense [Member]        
Share-based Compensation $ 895 $ 282 $ 2,050 $ 817