Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Roll Forward of Non-Vested Stock Options Activity (Detail)

v3.20.4
Stock-Based Compensation - Roll Forward of Non-Vested Stock Options Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Number of options, outstanding 3,056,759    
Number of shares, granted 845,120 969,720 2,457,102
Number of options, vested (1,672,739)    
Number of options, forfeited (65,331)    
Number of options, outstanding 2,163,809 3,056,759  
Weighted Average Grant Date Fair Value      
Weighted average granted date fair value, outstanding (in dollars per share) $ 3.60    
Weighted average granted date fair value, granted (in dollars per share) 8.88    
Weighted average granted date fair value, vested (in dollars per share) 3.27    
Weighted average granted date fair value, forfeited (in dollars per share) 5.14    
Weighted average granted date fair value, outstanding (in dollars per share) $ 6.07 $ 3.60