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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation 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.
On May 8, 2019, the board of directors approved the grant of time-based and performance-based RSUs under the Company's 2015 Incentive Award Plan. Stock-based compensation expense is recognized on a straight-line basis over the vesting period for time-based RSUs and recognized, when achievement of the performance condition is deemed probable, on a straight-line basis over the vesting period for performance-based RSUs. Forfeitures of all stock-based awards are recognized as they occur. As of September 30, 2019, there was $7,161 of total unrecognized compensation expense related to unvested stock-based compensation arrangements that will vest through December 2019, 2020 and 2021, as applicable. The Company recognized stock-based compensation expense of $1,289 and $3,454 for the three and nine months ended September 30, 2019, respectively, and $1,103 and $3,187 for the three and nine months ended September 30, 2018, respectively, as a part of general and administrative expenses on the condensed consolidated statements of operations and comprehensive income.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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