Subsequent Event (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Subsequent Event [Line Items]
Total proceeds	$ 134,140	$ 139,760
Controlled Equity Offering SM Sales Agreement [Member]
Subsequent Event [Line Items]
Company issued shares	3,818,300
Total proceeds	$ 24,500
Aggregate offering price of additional shares issued	$ 33,500