Income Taxes - Components of Loss from Continuing Operations before Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Disclosure [Abstract] | |||||||||||
| United States | $ (19,058) | $ (20,007) | $ (21,212) | $ (19,643) | $ (19,684) | $ (20,199) | $ (21,776) | $ (24,281) | $ (79,920) | $ (85,940) | $ (62,182) |