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Stockholders' Equity - Equity Offerings (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Sep. 28, 2017
Common Stock |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  | 3,126,709 | 3,126,709 |  |  |
September 2017 At-The-Market | Subsequent Event |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares | 1,010,033 |  |  |  |  |
Weighted average price per share issued | $ 4.65 |  |  |  |  |
Aggregate net proceeds from stock sale | $ 4.6 |  |  |  |  |
September 2017 At-The-Market | Common Stock |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  | 3,126,709 |  |  |  |
Weighted average price per share issued |  | $ 3.16 | $ 3.16 |  |  |
Aggregate net proceeds from stock sale |  | $ 9.6 |  |  |  |
Common stock available for sale under agreement |  |  |  |  | $ 70.1 |
Securities sold during period |  |  |  | 0 |  |
September 2017 At-The-Market | Common Stock | Maximum |  |  |  |  |  |
Equity offerings |  |  |  |  |  |
Common stock available for sale under agreement |  |  |  |  |  | $ 100.0

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