Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payment and Related Stock Option Plan - Summary of Share-based Payments to be a Level 3 Fair Value Measurement (Detail)

v3.21.2
Share-Based Payment and Related Stock Option Plan - Summary of Share-based Payments to be a Level 3 Fair Value Measurement (Detail)
9 Months Ended
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]  
Expected dividends 0.00%
Maximum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]  
Risk-free interest rate 2.47%
Expected term (life) of options (in years) 4 years
Expected volatility 86.30%
Minimum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]  
Risk-free interest rate 1.58%
Expected term (life) of options (in years) 2 years
Expected volatility 67.90%