Annual report pursuant to Section 13 and 15(d)

Income Taxes Component of Income Before Income Taxes (Details)

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Income Taxes Component of Income Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Domestic $ (26,889) $ (26,271) $ (18,450)
Foreign (2,639) (2,636) (1,167)
Total loss before income taxes $ (29,528) $ (28,907) $ (19,617)