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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Restricted Stock Awards | The following table summarizes the Company's RSA activity as of June 30,:
| 2021 |  | 2020
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Balance December 31, | 57,448 |  |  | $ | 11.75 |  |  | 52,755 |  |  | $ | 14.69 |
Granted | 44,708 |  |  | 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,:
| 2021 |  | 2020
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Balance December 31, | 1,125,766 |  |  | $ | 13.44 |  |  | 1,065,305 |  |  | $ | 12.78 |
Granted | 405,505 |  |  | 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,:
| 2021 |  | 2020
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Balance December 31, | 593,388 |  |  | $ | 14.88 |  |  | 288,281 |  |  | $ | 13.22 |
Granted | 397,981 |  |  | 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 Options |  | Weighted-Average Exercise Price per Share |  | Converted Mobile Mini Options |  | Weighted-Average Exercise Price per Share
Balance December 31 , 2020 | 534,188 |  |  | $ | 13.60 |  |  | 2,031,455 |  |  | $ | 14.78 |
Forfeited | — |  |  | — |  |  | (6,240) |  |  | 12.19 |
Exercised | — |  |  | — |  |  | (373,132) |  |  | 15.77 |
Balance June 30, 2021 | 534,188 |  |  | $ | 13.60 |  |  | 1,652,083 |  |  | $ | 14.57 |
Fully vested and exercisable options, June 30, 2021 | 400,641 |  |  | $ | 13.60 |  |  | 1,652,083 |  |  | $ | 14.57 |
The following table summarizes the Company's stock option activity as of June 30, 2020:
| WillScot Options |  | Weighted-Average Exercise Price per Share
Balance, December 31, 2019 | 534,188 |  |  | $ | 13.60 |
Balance, June 30, 2020 | 534,188 |  |  | $ | 13.60 |
Fully vested and exercisable options, December 31, 2019 | 133,547 |  |  | $ | 13.60 |
Vested | 133,547 |  |  | 13.60 |
Fully vested and exercisable options, June 30, 2020 | 267,094 |  |  | $ | 13.60 |

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