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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
Consolidated Balance Sheets    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized shares 125,000,000 125,000,000
Common stock, issued shares 33,919,684 33,916,559
Common stock, outstanding shares 33,919,684 33,916,559