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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Restricted Stock Unit Activity | The following table summarizes the Company's RSU activity under the Incentive Award Plan during the years ended December 31, 2020, 2019 and 2018:
| Unvested Time-Based RSUs |  | Unvested Performance-Based RSUs |  | Weighted Average Grant Date Value Per Share (a)
Outstanding as of January 1, 2018 | 1,535,505 |  | — |  | $3.19
Shares granted | 1,950,307 |  | — |  | $3.14
Shares vested | (1,349,852) |  | — |  | $3.20
Shares forfeited | (587,810) |  | — |  | $3.19
Outstanding as of December 31, 2018 | 1,548,150 |  | — |  | $3.18
Shares granted | 1,225,170 |  | 1,450,811 |  | $3.14
Shares vested | (1,275,188) |  | — |  | $3.18
Shares forfeited | (202,441) |  | (61,169) |  | $3.17
Outstanding as of December 31, 2019 | 1,295,691 |  | 1,389,642 |  | $3.14
Shares granted | 1,255,793 |  | 2,484,346 |  | $3.14
Shares vested | (1,144,343) |  | — |  | $3.14
Shares forfeited | (303,325) |  | (553,034) |  | $3.14
Outstanding as of December 31, 2020 | 1,103,816 |  | 3,320,954 |  | $3.14
(a)On May 8, 2020, the board of directors approved a grant of time-based and performance-based RSUs under the Incentive Award Plan at the most recent estimated net asset value per share of $3.14 as of May 1, 2019. Periodically, the Company engages an independent third-party valuation advisory consulting firm to estimate the per share value of the Company's common stock.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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