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Income Taxes - Components of loss before income tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes      
Domestic $ (11,375) $ (31,335) $ (161)
Foreign (25,000)    
Total $ (36,375) $ (31,335) $ (161)