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Loss Per Common Share - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Jul. 08, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                
Net loss $ (2,313) $ (3,526) $ (5,663) $ (7,488) $ (8,937) $ (11,299) $ (16,941) $ (13,151)
Weighted-average basic and diluted common shares outstanding (in shares) 1,725,906 97,691     183,395 109,539 228,447 108,123
Loss per share - basic and diluted (in dollars per share) $ (1.34) $ (36.09)     $ (48.73) $ (103.15) $ (74.16) $ (121.63)
Potentially dilutive shares excluded from computation of weighted-average diluted common shares outstanding (in shares)             6,222,448 6,528,052