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Condensed Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Operating expenses:        
Research and development $ 5,931 $ 3,722 $ 10,547 $ 6,818
General and administrative 1,833 1,642 3,578 3,016
Total operating expenses 7,764 5,364 14,125 9,834
Loss from operations (7,764) (5,364) (14,125) (9,834)
Other (expense) income:        
Other income, net 4 1 13 1
Interest expense (279)   (428)  
Total other (expense) income (275) 1 (415) 1
Net loss and comprehensive loss $ (8,039) $ (5,363) $ (14,540) $ (9,833)
Net loss per share - basic and diluted (in dollars per share) $ (8.07) $ (13.42) $ (19.46) $ (24.72)
Weighted-average common shares outstanding used in net loss per share - basic and diluted (in shares) 996,592 399,766 747,117 397,782