Quarterly report pursuant to Section 13 or 15(d)

Restructuring Costs (Additional Information) (Details)

v3.21.2
Restructuring Costs (Additional Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]          
Severance cost   $ 400      
Severance and transitional expenses to be paid         $ 400
Non cash stock-based compensation expense $ (1,236) (570) $ (865) $ (3,638)  
Unvested Stock Awards [Member]          
Restructuring Cost and Reserve [Line Items]          
Non cash stock-based compensation expense   $ (900)