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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowances $ 3,881 $ 2,582
Preferred stock, shares, issued (in shares) 0 0
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares, authorized (in shares) 5,000,000 5,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares, authorized (in shares) 100,000,000 100,000,000
Common Stock, shares, issued (in shares) 50,351,000 49,480,000
Common stock, shares, outstanding (in shares) 41,206,000 40,335,000
Treasury stock, shares (in shares) 9,145,000 9,145,000