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Leasehold Improvements and Equipment (Details) - USD ($)
Dec. 30, 2017
Dec. 31, 2016
Leasehold Improvements And Equipment Details    
Laboratory equipment (10 years) $ 1,869,000 $ 1,142,000
Leasehold improvements (Until the end of the lease term) 1,699,000 1,332,000
Computer equipment (3 to 5 years) 511,000 400,000
Furniture and fixtures (7 years) 90,000 41,000
Office equipment (10 years) 18,000 10,000
Construction in progress 131,000 170,000
Leasehold improvements, gross 4,318,000 3,095,000
Less accumulated depreciation 1,446,000 1,317,000
Leasehold improvements, total $ 2,872,000 $ 1,778,000