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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Restricted Stock Unit Activity | A summary of the Company's restricted stock unit activity during the years ended December 31, 2017, 2016 and 2015 is as follows:
| Unvested Restricted Stock Units |  | Weighted Average Grant Date Price Per Share (a)
Outstanding as of January 1, 2015 | — |  | — |
Shares granted | 1,689,625 |  | $4.00
Shares vested | (628,695) |  | $4.00
Shares forfeited | (109,375) |  | $4.00
Outstanding as of December 31, 2015 | 951,555 |  | $4.00
Shares granted | 2,410,341 |  | $3.14
Shares vested | (1,096,480) |  | $3.48
Shares forfeited | (618,893) |  | $3.47
Outstanding as of December 31, 2016 | 1,646,523 |  | $3.29
Shares granted | 2,019,078 |  | $3.29
Shares vested | (1,750,773) |  | $3.38
Shares forfeited | (379,323) |  | $3.25
Outstanding as of December 31, 2017 | 1,535,505 |  | $3.19
(a) | On an annual basis, the Company engaged an independent third-party valuation advisory consulting firm to estimate the per share value of the Company's common stock on a fully diluted basis.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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