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Stockholders' Equity - Equity Offerings (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Oct. 07, 2020	Sep. 28, 2017
Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares	2,517,603
September 2017 At-The-Market | Common Stock | Maximum
Equity offerings
Common stock available for sale under agreement			$ 100.0
October 2020 At-The-Market
Equity offerings
Issuance of common stock, net of issuance costs, shares	2,517,603
Price per share	$ 3.92
Aggregate net proceeds from stock sale	$ 9.6
Common stock available for sale under agreement	$ 86.3
October 2020 At-The-Market | Common Stock | Maximum
Equity offerings
Common stock available for sale under agreement		$ 100.0

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- Definition

Amount of common stock remaining available to be sold under the terms of the agreement at the end of the period.

+ References

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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