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Income Taxes (Components of Income Tax Provision (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ (26)us-gaap_CurrentFederalTaxExpenseBenefit $ (28)us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit) 161us-gaap_CurrentStateAndLocalTaxExpenseBenefit 99us-gaap_CurrentStateAndLocalTaxExpenseBenefit 67us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current Foreign Tax Expense (Benefit) 89us-gaap_CurrentForeignTaxExpenseBenefit 85us-gaap_CurrentForeignTaxExpenseBenefit 682us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) 224us-gaap_CurrentIncomeTaxExpenseBenefit 156us-gaap_CurrentIncomeTaxExpenseBenefit 749us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State, local and foreign 3hill_DeferredStateLocalAndForeignTaxExpenseBenefit (105)hill_DeferredStateLocalAndForeignTaxExpenseBenefit 0hill_DeferredStateLocalAndForeignTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) 3us-gaap_DeferredIncomeTaxExpenseBenefit (105)us-gaap_DeferredIncomeTaxExpenseBenefit 0us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision $ 227us-gaap_IncomeTaxExpenseBenefit $ 51us-gaap_IncomeTaxExpenseBenefit $ 749us-gaap_IncomeTaxExpenseBenefit