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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accumulated depreciation and amortization $ 6,746 $ 5,924
Preferred stock, par value (in dollars per share) $ 0.001  
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares outstanding 0 0
Common stock par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 21,964,598 21,853,263
Common stock, shares outstanding 21,801,016 21,643,342