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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock compensation expense (gain) $ 2,600   $ 2,300   $ 4,800 $ 4,500
Unrecognized stock-based compensation cost 8,800       $ 8,800  
Unrecognized share-based compensation expense, weighted-average recognition period (in years)         1 year 5 months 15 days  
Common stock issuance ESPP Plan 928 $ 796 $ 653 $ 419    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation cost $ 5,000       $ 5,000  
Unrecognized share-based compensation expense, weighted-average recognition period (in years)         1 year 5 months 23 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) 41,058   37,255   75,388 73,287
Common stock issuance ESPP Plan $ 200   $ 200   $ 400 $ 300