Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plans and Stock Based Compensation - Additional Information (Detail)

v3.22.1
Equity Incentive Plans and Stock Based Compensation - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 01, 2017
May 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Apr. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Total intrinsic value of stock options exercised     $ 1,200,000 $ 2,500,000  
Cash received from stock option exercises     1,620,000 1,040,000  
Tax benefit realized upon exercise of option     0 $ 0  
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the stock option plans     $ 33,200,000    
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the stock option plans, period for recognition     2 years 5 months 19 days    
2018 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Exercise price as a percentage of fair market value of common stock   100.00%      
Terms of stock options granted     10 years    
Terms of stock options vested     4 years    
Options to purchase shares of common stock available for future grants     1,202,612    
Options reserved for issuance transferred to 2018 Equity Incentive Plan         2,000,000
Common stock additional shares may be added to plan in connection in forfeiture or expiration of awards outstanding   2,885,121      
2018 Equity incentive plan annual evergreen provision to increase available for issuance description     Additionally, the number of shares of common stock that may be issued under the 2018 Plan shall increase on each January 1, beginning with January 1, 2019, and continuing through and including January 1, 2028 by an amount equal to the lesser of (i) 4% of the number of outstanding shares of common stock on that date and (ii) an amount determined by the Company’s board of directors or compensation committee; provided, however, that in no event will the number of shares available for issuance under the 2018 Plan be increased to the extent such increase, in addition to any other increases proposed by the board of directors in the number of shares available for issuance under all other employee or director stock plan would result in the total number of shares then available for issuance under all employee and director stock plans exceeding 20% of the outstanding shares of the Company’s common stock on the first day of the applicable fiscal year.    
Annual evergreen provision to increase available for issuance not to exceed percentage of common stock shares outstanding on date of increase   4.00%      
2018 Equity Incentive Plan | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Available for issuance for all plans not to exceed percentage of common stock outstanding on first day of fiscal year   20.00%      
2009 Stock Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options reserved for issuance transferred to 2018 Equity Incentive Plan         104,184
2014 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options reserved for issuance transferred to 2018 Equity Incentive Plan         335,040
2004 Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options to purchase shares of common stock available for future grants     8,636 8,636  
Additional shares authorized for issuance 9,091        
Offering period     24 months    
Purchase period     6 months    
Discount available to eligible employees related to employee stock purchase plan     85.00%    
Shares purchased by employees under purchase plan     0 0