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Condensed Statements of Comprehensive Loss (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating expenses:        
Research and development $ 3,019 $ 2,374 $ 5,867 $ 4,354
General and administrative 877 1,296 1,999 2,668
Total operating expenses 3,896 3,670 7,866 7,022
Loss from operations (3,896) (3,670) (7,866) (7,022)
Interest income 12 29 26 57
Other expense     (2) (1)
Net loss and comprehensive loss $ (3,884) $ (3,641) $ (7,842) $ (6,966)
Basic and diluted net loss per share attributable to common stock $ (0.15) $ (0.14) $ (0.30) $ (0.26)
Weighted-average number of common shares outstanding 26,545 26,545 26,545 26,545