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Stock Based Compensation (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Stock-based compensation expense | $ 700,000 | $ 600,000 | $ 1,900,000 | $ 1,300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award expiration Period |  |  | 10 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |
Maximum amount of performance units that could vest if performance targets were exceeded | 120,212 |  | 120,212 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 79,526 |  | 79,526 |  | 108,463 |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  | 53,454 |  |  |
Restricted shares granted |  |  | 11,979 |  |  |
Unrecognized compensation cost related to nonvested shares | $ 1,233,743 |  | $ 1,233,743 |  |  |
Weighted average period related to compesation cost |  |  | 2 years 3 months 18 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 73,069 |  | 73,069 |  | 29,423 |
Performance unit shares to satisfy tax obligation created from vesting, net |  |  | 4,904 |  |  |
Shares issued as a result of net performance share issued to satisfy tax obligation |  |  | 4,904 |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Unrecognized compensation cost related to nonvested shares | $ 1,400,000 |  | $ 1,400,000 |  |  |
Weighted average period related to compesation cost |  |  | 2 years 4 months 24 days |  |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  | 35,636 |  |  |
Unrecognized compensation cost related to nonvested shares | $ 800,000 |  | $ 800,000 |  |  |
Weighted average period related to compesation cost |  |  | 1 year 8 months 12 days |  |  |
Performance unit shares to satisfy tax obligation created from vesting, net |  |  | 25,991 |  |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  | 26,517 |  |  |
2017 Equity Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  |  |  |  | 750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  | 400,593 |  |  |

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