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Stockholders' Equity - Equity Offerings (Details) - Common Stock - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 28, 2017
Equity offerings |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  | 1,010,033 | 4,136,742 |  |
September 2017 At-The-Market |  |  |  |  |
Equity offerings |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  | 4,136,742 |  |
Weighted average price per share |  | $ 3.52 | $ 3.52 |  |
Aggregate net proceeds from stock sale |  |  | $ 14.1 |  |
Securities sold during period |  |  |  | 0 |
September 2017 At-The-Market | Maximum |  |  |  |  |
Equity offerings |  |  |  |  |
Common stock available for sale under agreement |  |  |  |  | $ 100.0
October 2020 At-The-Market | Subsequent Event |  |  |  |  |
Equity offerings |  |  |  |  |
Securities sold during period | 0 |  |  |  |
October 2020 At-The-Market | Maximum | Subsequent Event |  |  |  |  |
Equity offerings |  |  |  |  |
Common stock available for sale under agreement | $ 100.0 |  |  |  |

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