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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3)
12 Months Ended
Dec. 31, 2014
Rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
Minimum  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Discount Rate 19.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Fair Value Inputs Royalty Rate 2.00%hdng_FairValueInputsRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Discount Rate 22.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Fair Value Inputs Royalty Rate 3.00%hdng_FairValueInputsRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember