Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Loss Before Provision for Income Taxes (Details)

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Income Taxes - Components of Loss Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
United States $ (7,641) $ (20,980) $ (41,696)
Foreign (278) 1,653 306
Loss before provision for income taxes $ (7,919) $ (19,327) $ (41,390)