Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Narrative (Detail)

v3.20.2
Stock Based Compensation - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock compensation expense (gain) $ 2,700     $ 3,300     $ 7,500 $ 7,700
Unrecognized stock-based compensation cost 7,300           $ 7,300  
Unrecognized share-based compensation expense, weighted-average recognition period (in years)             1 year 11 months 4 days  
Common stock issuance ESPP Plan 808 $ 928 $ 796 $ 564 $ 653 $ 419    
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized stock-based compensation cost $ 4,200           $ 4,200  
Unrecognized share-based compensation expense, weighted-average recognition period (in years)             1 year 10 months 24 days  
Employee Stock Purchase Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee stock purchase plan, discount rate (as a percent)             15.00%  
Common stock issuance ESPP Plan (in shares) 29,853     28,672     105,241 101,959
Common stock issuance ESPP Plan $ 200     $ 100     $ 600 $ 400