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Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands			1 Months Ended			2 Months Ended	3 Months Ended	5 Months Ended	12 Months Ended			14 Months Ended
	Dec. 09, 2019	Nov. 22, 2019	Sep. 10, 2021	Jun. 18, 2021	Dec. 31, 2019	Dec. 31, 2021	Feb. 19, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Aug. 31, 2021	Jul. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock									$ 101,146,000	$ 21,047,000	$ 0
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]
Common stock sold and issued (in shares)			3,300	4,000		7,700	8,200					23,300
Weighted-average share price (in dollars per share)												$ 4.30
Offering sales commission (percent)									3.00%
Proceeds from issuance of common stock												$ 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]
Common stock sold and issued (in shares)								15,700
Weighted-average share price (in dollars per share)								$ 1.60
Offering sales commission (percent)								3.00%
Proceeds from issuance of common stock								$ 25,000,000
2021 Open Market Sales Agreement | Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price													$ 150,000,000
Underwritten public offering, including underwriter option
Subsidiary, Sale of Stock [Line Items]
Common stock sold and issued (in shares)	23,000
Gross proceeds from sale of stock					$ 143,800,000
Underwriting discounts, commissions, and offering expenses					8,900,000
Proceeds from issuance of common stock					$ 134,900,000
Underwritten public offering
Subsidiary, Sale of Stock [Line Items]
Common stock sold and issued (in shares)	20,000
Share price (in dollars per share)	$ 6.25
Underwriter option
Subsidiary, Sale of Stock [Line Items]
Common stock sold and issued (in shares)	3,000
Underwriter option period	30 days
Private Placement
Subsidiary, Sale of Stock [Line Items]
Common stock sold and issued (in shares)		2,900
Share price (in dollars per share)		$ 6.96
Proceeds from issuance of common stock		$ 20,000,000

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