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Quarterly Financial Data (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 Disclosure [Abstract]                      
Revenue $ 704 $ 684 $ 584 $ 743 $ 676 $ 435 $ 511 $ 370 $ 2,715 $ 1,992 $ 1,747
Costs and expenses 5,254 5,139 5,050 4,736 4,882 5,047 4,232 3,721 20,179 17,882 16,495
Operating loss (4,725) (4,627) (4,601) (4,212) (4,383) (4,724) (3,871) (3,462) (18,165) (16,440) (15,210)
Net loss $ (19,246) $ (12,596) $ (1,943) $ (11,332) $ (8,486) $ (1,004) $ (6,667) $ (1,813) $ (45,117) $ (17,971) $ (14,704)
Basic loss per share $ (0.75) $ (9.36) $ (3.50) $ (87.50) $ (1,292.02) $ (230.99) $ (1,543.50) $ (437.50)