Quarterly report pursuant to Section 13 or 15(d)

Share-based Compensation - Summary of Input Variables (Detail)

v3.21.1
Share-based Compensation - Summary of Input Variables (Detail) - Performance Shares [Member]
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.54% 0.18%
Expected life in years 4 years 3 years
Expected volatility 63.30% 65.90%
Expected dividend yield [1] 0.00% 0.00%
[1] The Monte Carlo method assumes a reinvestment of dividends.