STOCK BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stockholders' equity
Compensation expense related to stock options and restricted stock awards	$ 1.1	$ 0.5
Stock options
Weighted-average assumptions used to value stock options
Dividend yield (as a percent)	0.00%	0.00%
Weighted average volatility (as a percent)	60.71%	52.90%
Risk-free interest rate (as a percent)	1.90%	1.00%
Expected life	3 years 6 months	3 years 6 months
Number of Options
Outstanding at the beginning of the period (in shares)	1,987,159
Granted (in shares)	1,728,400
Forfeited or expired (in shares)	(97,433)
Outstanding at the end of the period (in shares)	3,618,126
Exercisable at the end of the period (in shares)	488,478
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 4.37
Granted (in dollars per share)	$ 1.11
Forfeited or expired (in dollars per share)	$ 3.17
Outstanding at the end of the period (in dollars per share)	$ 2.85
Exercisable at the end of the period (in dollars per share)	$ 3.88
Weighted Average Remaining Term (in years)
Outstanding at the end of the period	4 years 3 months
Exercisable at the end of the period	2 years 8 months 5 days
Additional disclosures
Total intrinsic value of options exercised	0	0.9
Total unrecognized stock-based compensation expense	3.3
Weighted Average Fair Value
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 8 months 12 days
Restricted Shares
Shares
Outstanding at the beginning of the period (in shares)	689,370
Granted (in shares)	521,322
Vested (in shares)	(599,241)
Outstanding at the end of the period (in shares)	611,451
Weighted Average Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 2.87
Granted (in dollars per share)	$ 1.11
Vested (in dollars per share)	$ 1.60
Outstanding at the end of the period (in dollars per share)	$ 2.61
Vesting period	3 years
Total unrecognized stock-based compensation expense	$ 1.3
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years