Stock-Based Compensation	9 Months Ended
Sep. 26, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION At September 26, 2018, options to purchase 2,130,802 shares of common stock were outstanding, including 1,741,217 vested and 389,585 unvested. Unvested options vest over time; however, upon a change in control, the board may accelerate vesting. At September 26, 2018, 1,392,785 premium options, options granted above the stock price at date of grant, remained outstanding. There were 249,091 stock option exercises during the thirteen and thirty-nine weeks ended September 26, 2018. For the thirteen weeks ended September 27, 2017, there were no stock option exercises. For the thirty-nine weeks ended September 27, 2017, there were stock option exercises of 17,661. For the thirteen and thirty-nine weeks ended September 26, 2018, there were 190,520 and 311,272 stock options granted at the fair market value on the date of grant, respectively. For the thirteen weeks ended September 27, 2017, there were no stock options granted. For the thirty-nine weeks ended September 27, 2017, there were 128,252 stock options granted at the fair market value on the date of grant. At September 26, 2018, the Company had total unrecognized compensation expense of $1.4 million related to unvested stock options, which it expects to recognize over a weighted-average period of 3.52 years. For the thirteen and thirty-nine weeks ended September 26, 2018, there were 211,060 restricted shares granted. For the thirteen and thirty-nine weeks ended September 27, 2017, there were 1,248 and 170,924 restricted shares granted, respectively at the fair market value on date of grant. At September 26, 2018, there were 316,012 unvested restricted shares outstanding. At September 26, 2018, the Company had total unrecognized compensation expense of $3.5 million related to unvested restricted shares, which it expects to recognize over a weighted-average period of 3.25 years. For the thirteen weeks ended September 26, 2018 there were no performance stock units granted. For the thirty-nine weeks ended September 26, 2018, there were 72,116 performance stock units granted at the fair market value on date of grant. These awards are subject to service-based and market-based vesting conditions. The service period is from May 2018 to May 2019 and the market-based conditions are based on stock price. There were no performance stock units granted for the thirteen and thirty-nine weeks ended September 27, 2017. At September 26, 2018, there were 72,116 unvested performance stock units outstanding. At September 26, 2018, the Company had total unrecognized compensation expense of $0.4 million related to performance stock units, which it expects to recognize over a weighted-average period of 4.62 years. For the thirteen weeks ended September 26, 2018 there were no restricted units granted. For the thirty-nine weeks ended September 26, 2018, there were 96,156 restricted units granted at the fair market value on date of grant. There were no restricted units granted for the thirteen and thirty-nine weeks ended September 27, 2017. At September 26, 2018, there were 96,156 unvested restricted units outstanding. At September 26, 2018, the Company had total unrecognized compensation expense of $0.9 million related to unvested restricted units, which it expects to recognize over a weighted-average period of 3.62 years. In connection with the retirement of our former President and CEO, the Company has modified his previously granted equity awards to accelerate the vesting of 33,545 shares, which would have otherwise vested in May 2018, and extended the exercise ability of all his vested and outstanding options until the expiration of the original term of such options. As a result, the Company incurred incremental stock-based compensation expense of $0.8 million for the thirty-nine weeks ended September 26, 2018. Total stock-based compensation expense was $0.4 million and $1.5 million for the thirteen and thirty-nine weeks ended September 26, 2018, respectively, and $0.3 million and $0.7 million for the thirteen and thirty-nine weeks ended September 27, 2017, respectively.

STOCK-BASED COMPENSATION

At September 26, 2018, options to purchase 2,130,802 shares of common stock were outstanding, including 1,741,217 vested and 389,585 unvested. Unvested options vest over time; however, upon a change in control, the board may accelerate vesting. At September 26, 2018, 1,392,785 premium options, options granted above the stock price at date of grant, remained outstanding. There were 249,091 stock option exercises during the thirteen and thirty-nine weeks ended September 26, 2018. For the thirteen weeks ended September 27, 2017, there were no stock option exercises. For the thirty-nine weeks ended September 27, 2017, there were stock option exercises of 17,661. For the thirteen and thirty-nine weeks ended September 26, 2018, there were 190,520 and 311,272 stock options granted at the fair market value on the date of grant, respectively. For the thirteen weeks ended September 27, 2017, there were no stock options granted. For the thirty-nine weeks ended September 27, 2017, there were 128,252 stock options granted at the fair market value on the date of grant. At September 26, 2018, the Company had total unrecognized compensation expense of $1.4 million related to unvested stock options, which it expects to recognize over a weighted-average period of 3.52 years.

For the thirteen and thirty-nine weeks ended September 26, 2018, there were 211,060 restricted shares granted. For the thirteen and thirty-nine weeks ended September 27, 2017, there were 1,248 and 170,924 restricted shares granted, respectively at the fair market value on date of grant. At September 26, 2018, there were 316,012 unvested restricted shares outstanding. At September 26, 2018, the Company had total unrecognized compensation expense of $3.5 million related to unvested restricted shares, which it expects to recognize over a weighted-average period of 3.25 years.

For the thirteen weeks ended September 26, 2018 there were no performance stock units granted. For the thirty-nine weeks ended September 26, 2018, there were 72,116 performance stock units granted at the fair market value on date of grant. These awards are subject to service-based and market-based vesting conditions. The service period is from May 2018 to May 2019 and the market-based conditions are based on stock price. There were no performance stock units granted for the thirteen and thirty-nine weeks ended September 27, 2017. At September 26, 2018, there were 72,116 unvested performance stock units outstanding. At September 26, 2018, the Company had total unrecognized compensation expense of $0.4 million related to performance stock units, which it expects to recognize over a weighted-average period of 4.62 years.

For the thirteen weeks ended September 26, 2018 there were no restricted units granted. For the thirty-nine weeks ended September 26, 2018, there were 96,156 restricted units granted at the fair market value on date of grant. There were no restricted units granted for the thirteen and thirty-nine weeks ended September 27, 2017. At September 26, 2018, there were 96,156 unvested restricted units outstanding. At September 26, 2018, the Company had total unrecognized compensation expense of $0.9 million related to unvested restricted units, which it expects to recognize over a weighted-average period of 3.62 years.

In connection with the retirement of our former President and CEO, the Company has modified his previously granted equity awards to accelerate the vesting of 33,545 shares, which would have otherwise vested in May 2018, and extended the exercise ability of all his vested and outstanding options until the expiration of the original term of such options. As a result, the Company incurred incremental stock-based compensation expense of $0.8 million for the thirty-nine weeks ended September 26, 2018. Total stock-based compensation expense was $0.4 million and $1.5 million for the thirteen and thirty-nine weeks ended September 26, 2018, respectively, and $0.3 million and $0.7 million for the thirteen and thirty-nine weeks ended September 27, 2017, respectively.