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Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Proceeds from issuance of common stock in at the market offering, net of issuance costs | $ 18,478,000 | $ 62,446,000 |  |
Common stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Maximum aggregate offering price |  |  |  | $ 250,000,000
2020 Open Market Sales Agreement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Issuance of common stock in at the market offering (in shares) |  | 9.0 |  |
Proceeds from issuance of common stock in at the market offering, net of issuance costs |  | $ 63,800,000 |  |
Weighted-average sales price per share (in dollars per share) |  | $ 7.10 |  |
2020 Open Market Sales Agreement | Common stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Maximum aggregate offering price |  |  |  | $ 100,000,000
2021 Open Market Sales Agreement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Issuance of common stock in at the market offering (in shares) | 20.5 |  |  |
Proceeds from issuance of common stock in at the market offering, net of issuance costs | $ 18,900,000 |  |  |
Weighted-average sales price per share (in dollars per share) | $ 0.92 |  |  |
Commission on sale of stock per agreement (percent) | 3.00% |  |  |
2021 Open Market Sales Agreement | Common stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Maximum aggregate offering price |  |  | $ 150,000,000 |

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