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Stockholders' Equity - Equity Offerings (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Oct. 07, 2020 | Sep. 28, 2017
Common Stock |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares | 2,517,603 | 3,126,709 |  |  |  |
September 2017 At-The-Market | Common Stock |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  |  | 3,126,709 |  |
Price per share |  | $ 3.16 |  | $ 3.16 |  |
Aggregate net proceeds from stock sale |  |  |  | $ 9.6 |  |
September 2017 At-The-Market | Common Stock | Maximum |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Common stock available for sale under agreement |  |  |  |  |  | $ 100.0
October 2020 At-The-Market |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  | 2,517,603 |  |  |
Price per share |  |  | $ 3.92 |  |  |
Aggregate net proceeds from stock sale |  |  | $ 9.6 |  |  |
Common stock available for sale under agreement |  |  | $ 86.3 |  |  |
October 2020 At-The-Market | Common Stock | Maximum |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Common stock available for sale under agreement |  |  |  |  | $ 100.0 |

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