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Stockholders' Equity - Equity Offerings (Details) - Common Stock - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended
	Oct. 07, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 28, 2017
Equity offerings
Issuance of common stock, net of issuance costs, shares		1,010,033	4,136,742
September 2017 At-The-Market
Equity offerings
Issuance of common stock, net of issuance costs, shares			4,136,742
Weighted average price per share		$ 3.52	$ 3.52
Aggregate net proceeds from stock sale			$ 14.1
Securities sold during period				0
September 2017 At-The-Market | Maximum
Equity offerings
Common stock available for sale under agreement					$ 100.0
October 2020 At-The-Market | Subsequent Event
Equity offerings
Securities sold during period	0
October 2020 At-The-Market | Maximum | Subsequent Event
Equity offerings
Common stock available for sale under agreement	$ 100.0

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