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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Consolidated Balance Sheets    
Accumulated depreciation of property and equipment (in dollars) $ 12,495 $ 13,353
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 142,691,986 125,027,034
Common stock, shares outstanding 142,691,986 125,027,034
Foreign currency translation adjustment, tax $ 1,293