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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 1,841 $ 2,683
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 2,000,000 2,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 73,979,882 58,644,559
Common stock, shares outstanding 73,979,882 58,644,559