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STOCKHOLDERS' EQUITY (Details 2) (Restricted Stock Units (RSUs) [Member], USD $)
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3 Months Ended |
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Mar. 31, 2015
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Restricted Stock Units (RSUs) [Member]
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| Unvested restricted stock activity | |
| Balance outstanding at the beginning of the period (in shares) | 3,100 |
| Forfeited (in shares) | (35) |
| Vested (in shares) | (856) |
| Granted (in shares) | 682 |
| Balance outstanding at the end of the period (in shares) | 2,891 |
| Weighted-Average Grant-Date Fair Value | |
| Balance at the beginning of the period (in dollars per share) | $ 14.44 |
| Forfeited (in dollars per share) | $ 14.84 |
| Vested (in dollars per share) | $ 11.77 |
| Granted (in dollars per share) | $ 22.43 |
| Balance at the end of the period (in dollars per share) | $ 17.11 |