Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Weighted Average Assumptions (Detail)

v3.20.4
Stock-Based Compensation - Weighted Average Assumptions (Detail) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate (as a percent) 0.70% 2.40% 2.50%
Expected volatility (as a percent) 42.70% 43.20% 43.00%
Dividend yield (as a percent) 0.00% 0.00% 0.00%
Weighted average fair value per share at grant date (in dollars per share) $ 8.88 $ 5.77 $ 2.80
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 3 years 9 months 18 days 3 years 1 year 7 months 6 days
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 5 years 6 months 5 years 6 months 4 years