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Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 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 |  | $ 52,845,000 | $ 67,189,000 |  |  |
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) |  |  |  | 23.3 |  |
Proceeds from issuance of common stock in at the market offering, net of issuance costs |  |  |  | $ 100,000,000 |  |
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) | 32.6 | 53.1 |  |  |  |
Proceeds from issuance of common stock in at the market offering, net of issuance costs | $ 35,100,000 | $ 54,000,000 |  |  |  |
Commission on sale of stock per agreement (percent) |  | 3.00% |  |  |  |
Weighted-average sales price per share (in dollars per share) | $ 1.08 | $ 1.02 |  |  |  |
Total of shares sold | 68.8 | 68.8 |  |  |  |
Total of gross proceeds | $ 79,000,000 | $ 79,000,000 |  |  |  |
2021 Open Market Sales Agreement | Common stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Maximum aggregate offering price |  |  |  |  | $ 150,000,000 |

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