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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Stock-based compensation is measured at the grant date, based on the calculated fair value of the award, and is recognized as expense over the requisite employee service period (generally the vesting period of the grant). The Company recognized $1.3 million in stock compensation expense for the twenty-six weeks ended June 30, 2018, with a corresponding increase to additional paid-in-capital. Stock compensation expense is included in SG&A in the Consolidated Statements of Operations. Stock Options The following table summarizes stock option activity (in thousands, except per share data):
| Stock Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted Average Remaining Term
Outstanding - December 30, 2017 | 420 |  |  | $ | 5.45 |  |  | $ | 14,068 |  |  | 5.7
Options granted | 2 |  |  | 44.03 |  |  |  |  |
Options exercised | (136 | ) |  | 3.34 |  |  |  |  |
Options canceled | (27 | ) |  | 6.68 |  |  |  |  |
Outstanding - June 30, 2018 | 259 |  |  | $ | 5.88 |  |  | $ | 11,963 |  |  | 5.3
The total grant-date fair value of stock options vested during the twenty-six weeks ended June 30, 2018 was $0.5 million. The total intrinsic value of stock options exercised during the twenty-six weeks ended June 30, 2018 was $6.3 million. As of June 30, 2018, total unrecognized compensation expense related to unvested stock options was $0.6 million, which is expected to be recognized over a weighted-average period of 1.4 years. Restricted Stock Units and Performance Stock Units The following table summarizes activity related to restricted stock units and performance stock units (in thousands, except per share data):
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Performance Stock Units |  | Weighted Average Grant Date Fair Value
Outstanding - December 30, 2017 | 94 |  |  | $ | 27.11 |  |  | 86 |  |  | $ | 27.63 |
Units granted | 59 |  |  | 44.25 |  |  | 54 |  |  | 44.27 |
Units vested | (28 | ) |  | 26.74 |  |  | (14 | ) |  | 26.25 |
Units canceled | (12 | ) |  | 27.83 |  |  | (7 | ) |  | 26.30 |
Outstanding - June 30, 2018 | 113 |  |  | $ | 36.07 |  |  | 119 |  |  | $ | 38.31 |
The fair value of restricted stock units and performance stock units is based on the closing market price of the stock on the date of grant. The restricted stock units granted during the twenty-six weeks ended June 30, 2018 vest over a three year service period. As of June 30, 2018, total unrecognized compensation expense related to unvested restricted stock units was $3.5 million, which is expected to be recognized over a weighted-average period of 2.2 years. The performance stock units vest based on the outcome of certain performance criteria. For performance stock units granted during the twenty-six weeks ended June 30, 2018, the amount of units that can be earned range from 0% to 100% of the number of performance awards granted, based on the achievement of certain adjusted EBITDA targets, as defined by the applicable award agreement, over a performance period of one to three years. The compensation expense related to the performance stock units is recognized over the vesting period when the achievement of the performance conditions become probable. During the twenty-six weeks ended June 30, 2018, there was a modification to certain awards resulting in additional compensation expense of $0.9 million over the remaining term of the awards. As of June 30, 2018, total unrecognized compensation expense related to unvested performance stock units was $4.1 million, which is expected to be recognized over a weighted-average period of 2.0 years. Restricted Stock Awards The fair value of the non-vested restricted stock awards is based on the closing price on the date of grant. As of June 30, 2018, total unrecognized compensation expense related to unvested restricted stock awards was $0.5 million, which will be recognized over a weighted average period of approximately 2.1 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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