STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Valuation Assumptions to Determine the Fair Value of Stock Options

The Black-Scholes model requires the input of highly subjective assumptions, which are summarized in the table below for the years ended December 31, 2013, 2012 and 2011.

	Years Ended December 31,
	2013	2012	2011
Expected dividend yield	—	—	—
Expected stock price volatility	83%	82%	77%
Risk-free interest rate	0.9%	0.5%	1.8%
Expected life of options in years	4.4	1.5 - 5	5

Schedule of Stock-Based Compensation by Type of Award and Category of Expense

Our stock-based compensation for the years ended December 31, 2013, 2012 and 2011 was as follows (in thousands):

	Years Ended December 31,
	2013		2012		2011
Stock-based compensation by type of award:
Stock options	$	1,289	$	1,527	$	2,167
Restricted stock units	124		18		112
Employee stock purchase plan	20		20		25
	$	1,433	$	1,565	$	2,304
Stock-based compensation by category of expense:
Cost of goods sold	$	52	$	68	$	82
Research, development and engineering	254		308		367
Selling, general and administrative	1,127		1,189		1,855
	$	1,433	$	1,565	$	2,304