Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Summary of Stock Option Activity (Detail)

v3.20.2
Stock Based Compensation - Summary of Stock Option Activity (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2019
shares
Sep. 30, 2020
$ / shares
shares
Number of shares    
Beginning balance (in shares) | shares   5,318,759
Options granted (in shares) | shares   845,120
Less:    
Options exercised (in shares) | shares 289,081 1,276,144
Options canceled or expired (in shares) | shares   63,169
Ending balance (in shares) | shares   4,824,566
Exercisable at September 30, 2020 (in shares) | shares   2,552,710
Weighted Average Exercise Price    
Weighted average exercise price, beginning balance (in dollars per share) | $ / shares   $ 9.97
Weighted average exercise price, granted (in dollars per share) | $ / shares   28.33
Less:    
Weighted average exercise price, exercised (in dollars per share) | $ / shares   7.75
Weighted average exercise price, canceled or expired (in dollars per share) | $ / shares   15.82
Weighted average exercise price, ending balance (in dollars per share) | $ / shares   13.72
Weighted average exercise price, exercisable, ending balance (in dollars per share) | $ / shares   $ 8.86