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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowances for doubtful accounts $ 1,827 $ 1,092
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 159,180,317 152,185,616
Common stock, shares outstanding (in shares) 159,180,317 152,185,616