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Stock-based Compensation - Compensation Cost (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Stock-based compensation expense | $ 410,000 | $ 492,000
Tax benefit from compensation expense | 0 | 0
Cash received from option exercised | $ 0 | $ 0

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