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Stockholders' Equity - Equity Issuances (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2022 | Jun. 04, 2021 | Jun. 30, 2019
Lincoln Park Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Aggregate offering amount authorized per agreement |  |  |  | $ 26.0
Commitment shares issued as consideration per agreement (in shares) | 181,510 |  |  |
Number of shares sold (in shares) | 250,000 |  |  |
Price of shares sold (in dollars per share) |  |  |  | $ 4.00
Gross price for stock transaction | $ 1.0 |  |  |
Term of agreement (in months) | 36 months |  |  |
Number of shares allowable to direct for Regular Purchase (in shares) |  |  |  | 100,000
Maximum obligation per directed purchase transaction for Regular Purchase |  |  |  | $ 2.5
Maximum shares allowed in Accelerated Purchase as percent of shares In Regular Purchase (percent) |  |  |  | 300.00%
Maximum shares allowed in Accelerated Purchase as percent of shares traded during specified period (percent) |  |  |  | 30.00%
Maximum beneficial ownership allowable per agreement (percent) |  |  |  | 9.99%
ATM Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Aggregate offering amount authorized per agreement |  |  | $ 50.0 |
Stock issued (shares) |  | 0 |  |

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