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Stockholders' Equity and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 28, 2019
Share-based Payment Arrangement [Abstract]  
NonVested Restricted Common Stock
 
Shares
 
Weighted
Average
Grant
Fair Value
Outstanding 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

Outstanding at December 30, 2017
2,629,274

 
3.31

Granted
1,549,000

 
2.25

Forfeited
(872,025
)
 
3.78

Vested
(1,093,000
)
 
3.05

Balance at December 29, 2018
2,213,249

 
2.51

Granted
645,000

 
0.57

Forfeited
(355,625
)
 
2.95

Vested
(639,500
)
 
2.98

Balance at December 28, 2019
1,863,124

 
$
1.60
Stock-Based Compensation Expense for the fiscal years 2019, 2018 and 2017 (no tax benefits were recognized):
 
2019
 
2018
 
2017
Cost of product revenues
$
102,629

 
$
418,605

 
$
490,481

Research and development
295,872

 
725,112

 
799,485

Selling, general and administrative
1,658,899

 
3,647,337

 
1,006,165

Total
$
2,057,400

 
$
4,791,054

 
$
2,296,131