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Stock-Based Compensation
 3 Months Ended
Mar. 27, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
STOCK-BASED COMPENSATION

At March 27, 2019, options to purchase 2,066,976 shares of common stock were outstanding, including 1,715,595 vested and 351,381 unvested. Unvested options vest over time; however, upon a change in control, the board may accelerate vesting. At March 27, 2019, 1,381,010 premium options, options granted above the stock price at date of grant, remained outstanding. A summary of stock option activity as of March 27, 2019 and changes during the thirteen weeks ended March 27, 2019 is as follows:

 
Shares
 
Weighted-Average
Exercise Price
Outstanding - December 26, 2018
2,102,404

 
$
7.68

Grants
—

 
—

Exercised
—

 
—

Forfeited, cancelled or expired
(35,428
)
 
12.90

Outstanding - March 27, 2019
2,066,976

 
$
7.59

Vested and expected to vest at March 27, 2019
2,058,427

 
$
6.83

Exercisable at March 27, 2019
1,715,595

 
$
6.83



At March 27, 2019, the Company had total unrecognized compensation expense of $1.1 million related to unvested stock options, which it expects to recognize over a weighted-average period of 3.07 years.

A summary of restricted share activity as of March 27, 2019 and changes during the thirteen weeks ended March 27, 2019 is as follows:

 
Shares
 
Weighted-Average
Fair Value
Unvested shares at December 26, 2018
490,700

 
$
10.91

Granted
—

 
$
—

Released
—

 
$
—

Forfeited, cancelled, or expired
(22,118
)
 
$
12.47

Unvested shares at March 27, 2019
468,582

 
$
10.83



Unvested shares at March 27, 2019, included 283,762 unvested restricted shares, 72,116 unvested performance stock units and 112,704 unvested restricted units outstanding.
At March 27, 2019, the Company had unrecognized compensation expense of $2.7 million related to unvested restricted shares, which it expects to recognize over a weighted-average period of 2.80 years, unrecognized compensation expense of $0.2 million related to performance stock units, which it expects to recognize over a weighted-average period of 2.76 years and unrecognized compensation expense of $1.0 million related to unvested restricted units, which it expects to recognize over a weighted-average period of 3.25 years.
Total stock-based compensation expense was $0.5 million for the thirteen weeks ended March 27, 2019 and $0.5 million for the thirteen weeks ended March 28, 2018.