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STOCK-BASED COMPENSATION
 3 Months Ended
Apr. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION
The fair value of non-vested restricted common stock awards is generally the market value of the Company’s common stock on the date of grant. The non-vested restricted common stock awards require the employee to fulfill certain obligations, including remaining employed by the Company for one, two or four years (the vesting period) and in certain cases also require meeting either performance criteria or the Company’s stock achieving a certain price. For non-vested restricted common stock awards which solely require the recipient to remain employed with the Company, the stock compensation expense is amortized over the anticipated service period. For non-vested restricted common stock awards which require the achievement of performance criteria, the Company reviews the probability of achieving the performance goals on a periodic basis. If the Company determines that it is probable that the performance criteria will be achieved, the amount of compensation cost derived for the performance goal is amortized over the anticipated service period. If the performance criteria are not met, no compensation cost is recognized and any previously recognized compensation cost is reversed. Some of the restricted stock awards vest upon our stock price achieving certain levels. These awards are referred to as Liability Awards and are mark to marketed. Accordingly in some periods there is expense and in other periods the expense may reverse. The Company recognizes compensation costs on a straight-line basis over the requisite service period for time-vested awards.
Non-Vested Restricted Common Stock
 
Shares
 
Weighted
Average
Grant
Fair
Value
Balance, December 31, 2016
3,007,674

 
$
3.21

Granted
60,000

 
3.43

Forfeited
—

 
—

Vested
—

 
—

Balance, April 1, 2017
3,067,674

 
$
3.22


Stock-Based Compensation
The following table summarizes stock-based compensation expense within each of the categories below as it relates to non-vested restricted common stock awards for the three months ended April 1, 2017 and March 26, 2016 (no tax benefits were recognized):
 
Three Months Ended
 
April 1,
2017
 
March 26,
2016
Cost of component revenues
$
104,092

 
$
142,534

Research and development
218,558

 
116,895

Selling, general and administrative
969,455

 
(202,975
)
Total
$
1,292,105

 
$
56,454


Unrecognized compensation expense for non-vested restricted common stock as of April 1, 2017 totaled $5.3 million and is expected to be recognized over a weighted average period of approximately three years.
The Selling, general and administrative expense includes Liability Awards and the increase in expense for the three month period ended April 1, 2017 as compared to March 26, 2016 is the result of a higher stock price of the Company at April 1, 2017 as compared to March 26, 2016. Included in Other accrued liabilities is $1.6 million in deferred compensation from equity awards which are classified as Liability Awards.