Restructuring - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Nov. 06, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0
Research and development expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ (1,900,000)
General and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges			700,000
Restructuring Plan, July 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date			7,400,000
Revised estimates during the year	$ 2,000,000.0
Restructuring reserve		0	$ 0
Restructuring Plan, November 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date				$ 1,600,000
Restructuring reserve		$ 0