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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |  |  |
Valuation allowance after adoption of ASC 326 |  | $ 73,048 | [1] | $ 61,408
Valuation allowance before adoption of ASC 326 | [1] |  |  | $ 61,408
Common stock, shares authorized (in shares) |  | 90,000,000 |  | 90,000,000
Common stock, no par value (in dollars per share) |  | $ 0 |  | $ 0
Common stock, shares issued (in shares) |  | 25,775,133 |  | 25,713,408
Common stock, shares outstanding (in shares) |  | 25,299,178 |  | 25,239,748
Treasury stock, at cost (in shares) |  | 475,955 |  | 473,660
[1] | Beginning January 1, 2021 calculation is based on the current expected credit loss methodology. Prior to January 1, 2021 calculation was based on the incurred loss methodology.

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