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Equity Award Plans (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Restricted Stock
A summary of activity related to restricted stock unit award grants under the 2017 Equity Incentive Plan during the year ended December 31, 2021 is as follows:

SharesWeighted Average Grant Date Fair Value
Non-vested at December 31, 2020799,240 $18.95 
Granted430,929 $13.51 
Canceled(31,207)$25.31 
Forfeited(22,010)$15.09 
Vested(348,550)$21.02 
 Outstanding at December 31, 2021828,402