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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table summarizes the Company's restricted stock unit ("RSU") activity for the nine months ended September 30, 2019:
| Unvested Time-Based RSUs |  | Unvested Performance-Based RSUs |  | Weighted-Average Grant Date Price Per Share (a)
Outstanding as of January 1, 2019 | 1,548,150 |  |  | — |  |  | $3.18
Shares granted | 1,225,170 |  |  | 967,201 |  |  | $3.14
Shares vested | (227,707 | ) |  | — |  |  | $3.14
Shares forfeited | (202,441 | ) |  | (40,779 | ) |  | $3.17
Outstanding at September 30, 2019 | 2,343,172 |  |  | 926,422 |  |  | $3.15
(a) On an annual basis, the Company engages an independent third-party valuation advisory 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=116856206&loc=d3e5070-113901 + Details
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