Restructuring - Schedule of restructuring costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Total Severance Expense	$ 3,537
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Total Severance Expense	2,248
General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total Severance Expense	$ 1,289