XML 68 R51.htm IDEA: XBRL DOCUMENT v3.22.0.1
Stockholders' Equity, Stock Plans and Stock-based Compensation Expense - Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 04, 2021
Dec. 31, 2018
Number of Shares            
Granted (in shares) 209,981          
Weighted-Average Grant- Date Fair Value            
Stock price (in dollars per share)   $ 41.32 $ 24.11 $ 35.81 $ 26.02 $ 17.02
RSUs            
Number of Shares            
Outstanding (in shares)   779,757 1,104,802 474,291    
Granted (in shares)   744,949 667,694 963,814    
Vested (in shares)   (254,946) (684,491) (172,281)    
Forfeited(in shares)   (236,856) (308,248) (161,022)    
Outstanding (in shares)   1,032,904 779,757 1,104,802    
Weighted-Average Grant- Date Fair Value            
Outstanding (in dollars per share)   $ 23.96 $ 22.10 $ 38.44    
Granted (in dollars per share)   40.16 20.66 18.68    
Vested (in dollars per share)   22.94 17.82 33.66    
Forfeited (in dollars per share)   27.33 23.24 37.91    
Outstanding (in dollars per share)   $ 35.00 $ 23.96 $ 22.10    
Vested, aggregate fair value   $ 8,287 $ 12,036 $ 6,169    
Aggregate intrinsic value   42,680 18,800 37,442   $ 8,072
Grant date fair value of awards vested   $ 5,800 $ 12,200 $ 5,900    
Stock price (in dollars per share)   $ 41.32 $ 24.11 $ 35.81   $ 17.02