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Restructuring Costs - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 18, 2020
Dec. 31, 2020
Jul. 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Restructuring Cost And Reserve [Line Items]          
Percentage of reduction in workforce 40.00% 40.00% 30.00%    
Severance costs related to reduction in workforce         $ 0.2
Accrued Compensation [Member]          
Restructuring Cost And Reserve [Line Items]          
Severance costs related to reduction in workforce $ 1.3     $ 1.3  
Operating Expenses [Member]          
Restructuring Cost And Reserve [Line Items]          
Severance costs related to reduction in workforce         $ 0.2
Noncash stock options compensation expenses $ 0.1     0.1  
Restructuring expense       1.4  
Research and development [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring expense       0.9  
General and administrative [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring expense       $ 0.5