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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, 2020	Jun. 30, 2021	Jun. 30, 2020	Oct. 07, 2020	Sep. 28, 2017
Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares	2,517,603	3,126,709
September 2017 At-The-Market | Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares				3,126,709
Price per share		$ 3.16		$ 3.16
Aggregate net proceeds from stock sale				$ 9.6
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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