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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 2 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Pre-tax losses of domestic $ (10,780)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (8,602)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic  
Pre-tax losses of foreign (281)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (215)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign  
Separation [Member]      
Operating Loss Carryforwards [Line Items]      
Pre-tax losses of domestic     (1,800)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
/ us-gaap_ConsolidationItemsAxis
= hart_SeparationMember
Pre-tax losses of foreign     $ (90)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_ConsolidationItemsAxis
= hart_SeparationMember