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Stockholders' Equity and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
NonVested Restricted Common Stock
 
Shares
 
Weighted
Average
Grant
Fair Value
Outstanding at December 27, 2014
2,551,631

 
$
3.75

Granted
1,255,696

 
3.77

Forfeited
(388,320
)
 
3.64

Vested
(1,226,991
)
 
3.68

Outstanding at December 26, 2015
2,192,016

 
3.82

Granted
1,663,000

 
2.40

Forfeited
(110,500
)
 
3.21

Vested
(736,842
)
 
3.17

Balance at December 31, 2016
3,007,674

 
3.21

Granted
1,152,000

 
3.40

Forfeited
(465,150
)
 
3.82

Vested
(1,065,250
)
 
2.90

Balance at December 30, 2017
2,629,274

 
$
3.31
Stock-Based Compensation Expense
for the fiscal years 2017, 2016 and 2015 (no tax benefits were recognized):
 
2017
 
2016
 
2015
Cost of product revenues
$
490,481

 
$
561,791

 
$
729,715

Research and development
799,485

 
527,081

 
776,946

Selling, general and administrative
1,006,165

 
1,336,454

 
1,638,818

Total
$
2,296,131

 
$
2,425,326

 
$
3,145,479