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Earnings Per Share (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Outstanding equity awards not included in the calculation of diluted net loss per share:    
Shares issued: Options exercised 62,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 632,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share decreases: Shares repurchased for tax purposes (1,000)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation (15,000)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Stock options    
Outstanding equity awards not included in the calculation of diluted net loss per share:    
Number of antidilutive securities excluded from computation of earnings per share 4,401,602us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
10,923,538us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Range of exercise prices, lower limit 4.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.47us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Range of exercise prices, upper limit 7.04us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
7.84us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Unvested restricted stock awards    
Outstanding equity awards not included in the calculation of diluted net loss per share:    
Number of antidilutive securities excluded from computation of earnings per share 336,708us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
43,220us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Shares issued: Restricted stock awards granted 283,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Warrant    
Outstanding equity awards not included in the calculation of diluted net loss per share:    
Number of antidilutive securities excluded from computation of earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
1,602,489us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Warrants, exercise price 0.00hill_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercsiePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
2.40hill_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercsiePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
2000ESPP    
Outstanding equity awards not included in the calculation of diluted net loss per share:    
Shares issued: Shares purchased under stock plan 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= hill_A2000EsppMember
198,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= hill_A2000EsppMember