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Property, Plant and Equipment
 12 Months Ended
Dec. 28, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment consisted of the following at December 28, 2019 and December 29, 2018:
 
Useful Life
 
2019
 
2018
Equipment
3-5 years
 
$
16,344,040

 
$
16,824,384

Leasehold improvements
Life of the lease
 
3,577,809

 
3,676,775

Furniture and fixtures
3 years
 
101,777

 
523,736

Equipment under construction
 
 
—

 
436,806

 
 
 
20,023,626

 
21,461,701

Accumulated depreciation and amortization
 
 
(18,550,285
)
 
(18,862,859
)
Property, plant and equipment, net
 
 
$
1,473,341

 
$
2,598,842


Depreciation expense for the fiscal years 2019, 2018 and 2017 was approximately $0.8 million, $1.0 million and $0.9 million, respectively.
During the fiscal year 2018, the Company recorded asset impairment charges of $2.5 million associated with equipment that either is not currently being utilized or will not be utilized for its remaining useful life and is not recoverable.