SHARE-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2013

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

A summary of stock option activity under the Plan as of December 31, 2013, and changes during the year ended December 31, 2013 are presented below:



	Shares		Weighted Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)
Outstanding as of January 1, 2013	1,789,127		$	4.00
Granted	762,763		4.82
Exercised	(38,577	)	3.64
Forfeited	(208,230	)	4.64
Expired	(6,000	)	25.95
Outstanding as of December 31, 2013	2,299,083		$	4.16	8.01
Vested and exercisable as of December 31, 2013	1,167,772		$	4.45	7.36
Vested and expected to vest as of December 31, 2013	2,089,628		$	4.17	8.05

Schedule of Stock Options, Valuation Assumptions

The assumptions used to determine the value of our stock-based awards under the Black-Scholes method are summarized below:



	2013	2012
Risk-free interest rate	0.36% - 2.7%	0.37% - 1.6%
Dividend yield	—%	—%
Expected volatility	56.5% - 67.6%	56.8% - 77.9%
Average expected life in years	7.0	5.0

Schedule of Restricted Stock and Restricted Stock Units Award Activity

A summary of restricted stock awards and deferred stock units activity under the Plan as of December 31, 2013, and changes during the year then ended are presented below:



	Number of Restricted Shares and Units		Weighted-Average Grant Date Fair Value
Nonvested balance as of January 1, 2013	13,656		$	4.08
Vested	(9,255	)	4.41
Forfeited	(1,067	)	6.58
Nonvested balance as of December 31, 2013	3,334		$	2.35

Schedule of Employee Stock Purchase Plan, Valuation Assumptions

The assumptions used to value the shares under the ESPP using the Black-Scholes method were as follows:



	2013	2012
Risk-free interest rate	0.02% - 0.07%	0.02% - 0.10%
Dividend yield	—%	—%
Expected volatility	24.2% - 64.7%	48.9% - 93.1%
Expected life in years	3 months	3 months