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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, 2022	Jun. 30, 2021	Mar. 31, 2022
Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares	2,517,603
2020 Sales Agreement
Equity offerings
Issuance of common stock, net of issuance costs, shares		0	2,517,603
Price per share			$ 3.92
Aggregate net proceeds from stock sale			$ 9.6
2022 Sales Agreement
Equity offerings
Common stock available for sale under agreement				$ 100.0

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+ References

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