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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information (Unaudited)                      
Revenue $ 250 $ 250             $ 500    
Operating expenses 5,712 7,202 $ 6,919 $ 7,761 $ 8,673 $ 8,283 $ 9,396 $ 9,206 27,594 $ 35,558 $ 31,659
Net loss $ (5,497) $ (7,017) $ (6,974) $ (7,876) $ (8,778) $ (8,419) $ (9,445) $ (9,418) $ (27,094) $ (35,558) $ (31,659)
Net loss per share:                      
Basic and Diluted (in dollars per share) $ (0.24) $ (0.31) $ (0.32) $ (0.41) $ (0.47) $ (0.54) $ (0.61) $ (0.61) $ (1.26) $ (2.22) $ (4.06)
Weighted-average common shares outstanding used in net loss per share:                      
Basic and Diluted (in shares) 23,218,476 22,563,174 21,796,194 19,093,273 18,699,480 15,512,608 15,373,964 15,335,516 21,681,534 16,230,190 8,041,948