Quarterly report pursuant to Section 13 or 15(d)

Restructuring Costs - Additional Information (Detail)

v3.19.3
Restructuring Costs - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Employee Severance [Member]        
Restructuring Cost And Reserve [Line Items]        
Payments for restructuring $ 0.8     $ 1.0
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]        
Non-cash settlements   $ 0.3 $ 0.3