Annual report pursuant to Section 13 and 15(d)

Restructuring Costs - Additional Information (Detail)

v3.20.1
Restructuring Costs - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]      
Accrued severance liability     $ 0.1
Employee Severance [Member] | Operating Expense [Member]      
Restructuring Cost And Reserve [Line Items]      
Severance expenses $ 0.9 $ 1.2  
Stock Compensation Expense [Member] | Operating Expense [Member]      
Restructuring Cost And Reserve [Line Items]      
Increase in noncash stock compensation expenses $ 0.3 $ 0.3