Nature of Operations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash and cash equivalents	$ 76,500		$ 67,737
Total proceeds	$ 134,140	$ 139,760
Controlled Equity Offering SM Sales Agreement [Member]
Company issued shares	3,818,300
Total proceeds	$ 24,500