SHARE-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2016

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

Schedule of Stock Options Activity

A summary of stock option activity under the Plan is as follows: 

	Shares		Weighted Average Exercise Price		Weighted-Average Remaining Contractual Term (in yrs)
Outstanding as of January 1, 2016	2,417,541		$	4.74
Granted	336,740		4.64
Exercised	(63,704	)	3.34
Forfeited/expired	(179,879	)	6.21
Expired	(13,500	)	14.33
Outstanding as of December 31, 2016	2,497,198		$	4.61	6.48
Vested and exercisable as of December 31, 2016	1,834,861		$	4.23	5.76

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: 

	2016	2015	2014
Risk-free interest rate	1.27% - 2.26%	1.71% - 2.4%	1.90% - 3.0%
Dividend yield	—%	—%	—%
Expected volatility	50.0% - 61.9%	59.9% - 66.9%	60.6% - 67.1%
Expected life in years	8.2	7.6	7.0

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:

	2016	2015	2014
Risk-free interest rate	0.21% - 0.51%	0.00% - 0.16%	0.02% - 0.05%
Dividend yield	—%	—%	—%
Expected volatility	37.6% - 68.1%	21.9% - 78.9%	20.7% - 23.5%
Expected life in years	3 months	3 months	3 months