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Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Aug. 31, 2021	Jul. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock in at the market offering, net of issuance costs		$ 52,845,000	$ 67,189,000
Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price						$ 250,000,000
2020 Open Market Sales Agreement
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock in at the market offering (in shares)				23.3
Proceeds from issuance of common stock in at the market offering, net of issuance costs				$ 100,000,000
2020 Open Market Sales Agreement \| Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price						$ 100,000,000
2021 Open Market Sales Agreement
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock in at the market offering (in shares)	32.6	53.1
Proceeds from issuance of common stock in at the market offering, net of issuance costs	$ 35,100,000	$ 54,000,000
Commission on sale of stock per agreement (percent)		3.00%
Weighted-average sales price per share (in dollars per share)	$ 1.08	$ 1.02
Total of shares sold	68.8	68.8
Total of gross proceeds	$ 79,000,000	$ 79,000,000
2021 Open Market Sales Agreement \| Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price					$ 150,000,000