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Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity |  |  |  |  |
Proceeds from common stock issued, net of issuance costs |  |  | $ 1,005,000 | $ 14,578,000 |
Common Stock |  |  |  |  |
Equity |  |  |  |  |
Number of shares repurchased |  | 45,030 | 31,326 | 42,089 |
Common Stock | Subsequent Event |  |  |  |  |
Equity |  |  |  |  |
Number of shares repurchased | 34,016 |  |  |  |
Common Stock | Equity Distribution Agreements |  |  |  |  |
Equity |  |  |  |  |
Maximum offering capacity under shelf registration statement |  | $ 200,000,000 |  |  | $ 200,000,000
Shares common stock sold |  | 0 | 22,244 | 312,881 |
Proceeds from common stock issued, net of issuance costs |  |  | $ 1,005,000 | $ 14,600,000 |
Compensation paid to sales agents |  |  | 18,000 | 260,000 |
Reclassification of accumulated costs to additional paid in capital |  |  | 76,000 | $ 49,000 |
Amount available under effective shelf registration statement |  | $ 200,000,000 | $ 184,139,000 |  |

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