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Income Taxes - Income Before Income Tax, Domestic and Foreign (Details) - USD ($)
$ 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
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]                      
United States                 $ (44,246) $ (43,952) $ (42,788)
Foreign                 (119) (1) (618)
Loss before provision (benefit) for income taxes $ (14,327) $ (14,048) $ (10,163) $ (5,827) $ (7,515) $ (12,899) $ (11,513) $ (12,026) $ (44,365) $ (43,953) $ (43,406)