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Stock-Based Compensation - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation cost not yet recognized | $ 6,528,000 |  |
Stock-based compensation expense | 5,541,000 | $ 4,330,000 | $ 3,355,000
Allocated share-based compensation expense | 5,541,000 | 4,330,000 | 5,782,000
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Allocated share-based compensation expense | $ 0 | $ 0 | $ 0
2015 Incentive Award Plan | 2015 Incentive Award Plan approved on June 19, 2015 | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (shares) | 30,000,000 |  |
Number of shares available for grant (shares) | 21,213,679 |  |

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