Annual report pursuant to Section 13 and 15(d)

Restructuring - Additional Information (Detail)

v3.21.1
Restructuring - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Restructuring and Impairment charges   $ 5,100
Restructuring charges $ (705) 5,075
Restructuring benefit 700  
Change in estimates 952  
Non cash,Restructuring Stock based compensation expense 200  
Special Termination Benefits [Member]    
Restructuring Cost and Reserve [Line Items]    
Change in estimates 539  
Contract Termination [Member]    
Restructuring Cost and Reserve [Line Items]    
Change in estimates $ 413  
Restructuring Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   1,800
Nonrefundable prepaid research and development costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   900
Stock based compensation [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   $ 900