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Net (Loss) Income per Share Attributable to Common Stock (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
Net (Loss) Income per Share Attributable to Common Stock                      
Net loss $ (4,544) $ (2,759) $ (14,809) $ (9,154) $ (7,187) $ (12,416) $ (11,589) $ (8,600) $ (31,266) $ (39,792) $ (26,279)
Basic loss attributable to common stock                 (31,266) (39,792) (26,279)
Diluted loss attributable to common stock                 $ (31,266) $ (39,792) $ (26,279)
Weighted average common shares outstanding:                      
Basic                 21,694,645 21,611,562 20,688,185
Diluted                 21,694,645 21,611,562 20,688,185
Basic loss attributable to a share of common stock $ (0.21) $ (0.13) $ (0.68) $ (0.42) $ (0.33) $ (0.57) $ (0.54) $ (0.40) $ (1.44) $ (1.84) $ (1.27)
Diluted loss attributable to a share of common stock $ (0.21) $ (0.13) $ (0.68) $ (0.42) $ (0.33) $ (0.57) $ (0.54) $ (0.40) $ (1.44) $ (1.84) $ (1.27)