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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5)
9 Months Ended
Mar. 03, 2015
Sep. 30, 2015
Sep. 30, 2014
March 2015 Restructuring      
Stock-Based Compensation      
Original exercise period for vested outstanding awards after termination 90 days    
Modified exercise period for vested outstanding awards after termination 1 year    
Stock options      
Stock-Based Compensation      
Vesting period of awards   4 years  
Assumptions used to estimate fair value of awards      
Dividend yield (as a percent)   0.00% 0.00%
Expected volatility range, minimum (as a percent)   87.40% 89.80%
Expected volatility range, maximum (as a percent)   88.40% 92.20%
Risk-free interest rate range, minimum (as a percent)   1.68% 1.64%
Risk-free interest rate range, maximum (as a percent)   1.71% 1.92%
Expected term   5 years 6 months 5 years 6 months
Employee Stock Purchase Plan      
Assumptions used to estimate fair value of awards      
Dividend yield (as a percent)   0.00% 0.00%
Expected volatility range, minimum (as a percent)   65.40% 83.50%
Expected volatility range, maximum (as a percent)   139.20% 166.60%
Risk-free interest rate range, minimum (as a percent)   0.11% 0.06%
Risk-free interest rate range, maximum (as a percent)   0.28% 0.15%
Employee Stock Purchase Plan | Minimum      
Assumptions used to estimate fair value of awards      
Expected term   6 months 6 months
Employee Stock Purchase Plan | Maximum      
Assumptions used to estimate fair value of awards      
Expected term   12 months 12 months
Service-based restricted stock awards      
Stock-Based Compensation      
Vesting period of awards   4 years