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STOCK-BASED COMPENSATION Defined contribution plan and non-cash employer-matching contributions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Discolusre of Defined Contribution Plan Related Costs, Share-based Payments [Abstract]    
Share-based compensation arrangement award vesting period 5 years  
Defined contribution pan, maximum annual contribution per employee percent 15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent  
Defined contribution plan, employer matching contribution percent 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent  
Expense recognized for the 401(k) plan $ 75us-gaap_DefinedContributionPlanCostRecognized $ 162us-gaap_DefinedContributionPlanCostRecognized
Number of shares of the Company's common stock issued (in thousands) 0us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan 0us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Market value per share of the Company's common stock on contribution date (in dollars) $ 2.71hson_MarketPriceofStockIssuedDuringPeriodPerShareEmployeeBenefitPlan $ 0.00hson_MarketPriceofStockIssuedDuringPeriodPerShareEmployeeBenefitPlan
Non-cash contribution made for employer matching liability 0hson_DefinedContributionPlanEmployerDiscretionaryNonCashContributionMadeForEmployerMatchingLiability 0hson_DefinedContributionPlanEmployerDiscretionaryNonCashContributionMadeForEmployerMatchingLiability
Additional cash contribution made for employer-matching liability 0us-gaap_OtherPostretirementBenefitsPayments 0us-gaap_OtherPostretirementBenefitsPayments
Total contribution made for employer-matching liability $ 0hson_CashAndNoncashPensionAndOtherPostretirementContributions $ 0hson_CashAndNoncashPensionAndOtherPostretirementContributions