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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Restricted Stock Awards The following table summarizes the Company's RSA activity as of June 30,:
20212020
Number of SharesWeighted-Average Grant Date Fair ValueNumber of SharesWeighted-Average Grant Date Fair Value
Balance December 31,57,448 $11.75 52,755 $14.69 
Granted44,708 29.30 65,959 11.75 
Forfeited(4,266)29.30 — — 
Vested(57,448)11.75 (52,755)14.69 
Balance June 30, 40,442 $29.30 65,959 $11.75 
Restricted Stock Units The following table summarizes the Company's Time-Based RSU activity as of June 30,:
20212020
Number of SharesWeighted-Average Grant Date Fair ValueNumber of SharesWeighted-Average Grant Date Fair Value
Balance December 31,1,125,766 $13.44 1,065,305 $12.78 
Granted405,505 27.20 174,020 16.78 
Forfeited(65,153)16.74 (15,106)13.45 
Vested(147,592)12.90 (323,678)12.93 
Balance June 30, 1,318,526 $17.57 900,541 $13.49 
The following table summarizes the Company's Performance-Based RSU award activity as of June 30,:
20212020
Number of SharesWeighted-Average Grant Date Fair ValueNumber of SharesWeighted-Average Grant Date Fair Value
Balance December 31,593,388 $14.88 288,281 $13.22 
Granted397,981 39.10 202,923 16.82 
Forfeited(20,077)25.87 (12,700)14.70 
Balance June 30, 971,292 $24.56 478,504 $14.71 
Stock Option Awards The following table summarizes the Company's stock option activity as of June 30, 2021:
WillScot OptionsWeighted-Average Exercise Price per ShareConverted
Mobile Mini Options
Weighted-Average Exercise Price per Share
Balance December 31 , 2020534,188 $13.60 2,031,455 $14.78 
Forfeited— — (6,240)12.19 
Exercised— — (373,132)15.77 
Balance June 30, 2021534,188 $13.60 1,652,083 $14.57 
Fully vested and exercisable options, June 30, 2021400,641 $13.60 1,652,083 $14.57 
The following table summarizes the Company's stock option activity as of June 30, 2020:
WillScot OptionsWeighted-Average Exercise Price per Share
Balance, December 31, 2019534,188 $13.60 
Balance, June 30, 2020534,188 $13.60 
Fully vested and exercisable options, December 31, 2019133,547 $13.60 
Vested 133,547 13.60 
Fully vested and exercisable options, June 30, 2020267,094 $13.60