Stockholders' Equity - Shares Issued (Details) - USD ($) |
6 Months Ended | |
|---|---|---|
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 | |