Subsequent Event -ATM financing facility (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Proceeds from public offering of common stock, net of issuance costs	$ 123,829	$ 213,303
Common Stock Preferred Stock Debt Securities And Warrant
Subsequent Event [Line Items]
Sale Of Stock Value of Shares Available for Sale			$ 79,300
At-the-market offering
Subsequent Event [Line Items]
Sale Of Stock Value of Shares Available for Sale			17,000
At-the-market offering | Financing Facility 2019 Sales Agreement
Subsequent Event [Line Items]
Proceeds from public offering of common stock, net of issuance costs			$ 14,600
Common stock issued (in shares)			422,367