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Selected Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Table Text Block]
Quarterly Periods During Fiscal Year Ended December 30, 2017: 
(in thousands, except per share data)
Three months
ended
April 1, 2017
 
Three months
ended
July 1, 2017
 
Three months
ended
September 30, 2017
 
Three months
ended
December 30,
2017 (3)
Total revenue
$
4,378

 
$
5,927

 
$
6,139

 
$
11,397

Gross profit (2)
816

 
862

 
1,444

 
3,654

Loss from operations
(8,663
)
 
(8,068
)
 
(8,605
)
 
(4,962
)
Net loss attributable to the controlling interest
(7,858
)
 
(7,332
)
 
(8,247
)
 
(1,803
)
Net loss per share (1):
 
 
 
 
 
 
 
Basic and diluted
$
(0.12
)
 
$
(0.10
)
 
$
(0.11
)
 
$
(0.02
)
Weighted average number of common shares outstanding:
 
 
 
 
 
 
 
Basic and diluted
64,539

 
70,627

 
72,188

 
72,349

(1)
Net loss per share is computed independently for each of the quarters presented; accordingly, the sum of the quarterly net income per share may not equal the total computed for the year.
(2)
Gross profit is defined as net product revenues less cost of product revenues.
(3)
Includes $1.7 million impact on net gain attributable to the controlling interest relating to the gain on a warrant for the three month period ended December 30, 2017.
 
Quarterly Periods During Fiscal Year Ended December 31, 2016:
(in thousands, except per share data)
Three months
ended
March 26,
2016
 
Three months
ended
June 25,
2016 (3)
 
Three months
ended
September 24,
2016
 
Three months
ended
December 31,
2016 (4)
Total revenue
$
6,119

 
$
4,355

 
$
5,795

 
$
6,373

Gross profit (2)
1,342

 
(550
)
 
949

 
1,560

Loss from operations
(6,317
)
 
(993
)
 
(6,883
)
 
(6,280
)
Net loss attributable to the controlling interest
(6,932
)
 
(3,194
)
 
(8,117
)
 
(5,190
)
Net loss per share (1):
 
 
 
 
 
 
 
Basic and diluted
$
(0.11
)
 
$
(0.05
)
 
$
(0.13
)
 
$
(0.08
)
Weighted average number of common shares outstanding:
 
 
 
 
 
 
 
Basic and diluted
63,978

 
64,011

 
64,048

 
64,138


(1)
Net loss per share is computed independently for each of the quarters presented; accordingly, the sum of the quarterly net income per share may not equal the total computed for the year.
(2)
Gross profit is defined as net product revenues less cost of product revenues.
(3)
Includes $7.7 million impact on net gain attributable to the controlling interest relating to the gain on sale of a facility for the three month period ended June 25, 2016.
(4)
Includes $1.0 million impact on net gain attributable to the controlling interest relating to the gain on sale of an investment for the three month period ended December 31, 2016.
Schedule of Quantifying Prior Year Misstatements Corrected in Current Year Financial Statements [Table Text Block]