EMPLOYEE STOCK PLANS - Equity Incentive Plan (Details)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Vested on the First Anniversary, Vesting Percentage	25.00%
2012 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, as a percent of fair market value of common stock on grant date	100.00%
Options Vested on the First Anniversary, Vesting Percentage	25.00%
Award Ratable Vesting Percentage	2.78%
Award Ratable Vesting Period	36 months
2012 Equity Incentive Plan | Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award terms	7 years