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Stockholders' Equity - Shares Issued (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Class of Stock [Line Items] |  |
Proceeds from issuance of common stock, net of transaction costs | $ 0 | $ 29,380,000
Common Stock |  |
Class of Stock [Line Items] |  |
Public offering (in shares) | 113,349 |
Common Stock | Company Employees |  |
Class of Stock [Line Items] |  |
Public offering (in shares) | 1,676,680 |
Common Stock | Board Members |  |
Class of Stock [Line Items] |  |
Public offering (in shares) | 233,779 |
Common Stock | Prior Company Executives |  |
Class of Stock [Line Items] |  |
Public offering (in shares) | 227,876 |
Common Stock | Consultant |  |
Class of Stock [Line Items] |  |
Public offering (in shares) | 23,078 |
Common Stock | Officers And Directors Plan |  |
Class of Stock [Line Items] |  |
Public offering (in shares) | 1,554 |
Proceeds from issuance of common stock, net of transaction costs | $ 1,500 |

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