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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 28, 2019

Share-based Payment Arrangement [Abstract]

NonVested Restricted Common Stock

	Shares			Weighted Average Grant Fair Value
Balance, December 29, 2018	2,213,249			$	2.51
Granted	150,000			1.19
Forfeited	(275,625	)		2.95
Vested	(70,000	)		3.32
Balance, September 28, 2019	2,017,624			$	2.33

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The value of restricted stock grants that vest based on market conditions is computed on the date of grant using the Monte Carlo model with the following assumptions:

	For the three months ended September 28, 2019
Performance price target	$	5.25			$	6.00			$	7.00
Expected volatility	48.3		%		48.3		%		48.3		%
Interest rate	1.97		%		1.97		%		1.97		%
Expected life (years)	3				3				3
Dividend yield	—		%		—		%		—		%

Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense within each of the categories below as it relates to non-vested restricted common stock awards for the nine months ended September 28, 2019 and September 29, 2018 (no tax benefits were recognized):

	Three Months Ended								Nine Months Ended
	September 28, 2019				September 29, 2018				September 28, 2019				September 29, 2018
Cost of product revenues	$	18,309			$	52,368			$	82,524			$	318,519
Research and development	73,939				159,436				262,454				627,519
Selling, general and administrative	359,435				979,026				1,461,021				2,932,581
Total	$	451,683			$	1,190,830			$	1,805,999			$	3,878,619

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