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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 41 $ 52
Common Stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 500,000 500,000
Common stock, shares issued (in shares) 76,346 77,580
Common stock, shares outstanding (in shares) 76,346 77,580
Treasury stock, shares (in shares) 5,578 678