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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 2,401 $ 790
Common stock, par value $ 0.0005 $ 0.0005
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 56,418,136 53,717,996
Common stock, shares outstanding 56,065,613 53,557,761
Treasury stock, shares 352,523 160,235
Series A Preferred Stock [Member]    
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Series B Preferred Stock [Member]    
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0