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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 454 | $ 460
Common stock, shares authorized (in shares) | 50,000,000 | 50,000,000
Common stock, shares issued (in shares) | 19,302,000 | 19,204,000
Common stock, shares outstanding (in shares) | 19,302,000 | 19,204,000

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