Quarterly report pursuant to Section 13 or 15(d)

Stock Option and Incentive Plans - Additional Information (Detail)

v3.21.2
Stock Option and Incentive Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2021
Dec. 31, 2015
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jul. 28, 2014
Apr. 29, 2014
Feb. 24, 2014
Feb. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares of common stock reserved pursuant to the plan     15,304,629   15,304,629   14,245,213        
Weighted average grant date fair value of options     $ 4.22 $ 5.59 $ 4.35 $ 9.87          
Unrecognized compensation cost related to unvested stock options     $ 7.2   $ 7.2            
Weighted average period of unvested stock options         2 years 8 months 15 days            
Employee Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Compensation expense recognized     $ 0.9 $ 0.7 $ 1.5 $ 1.3          
Amended and Restated 2008 Equity Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares of common stock reserved pursuant to the plan                     157,143
Termination of service, Period         2 years            
2008 Equity Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares of common stock reserved pursuant to the plan                 235,714 185,714  
Termination of service, Period         10 years            
2014 Omnibus Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares of common stock reserved pursuant to the plan               57,143      
Number of additional shares increases of common stock reserved pursuant to the plan 2,695,373                    
2014 Omnibus Incentive Plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Annual increase of plan, percentage of common stock shares outstanding   4.00%