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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Cash Flows [Abstract]      
Net income (loss) $ 8,055us-gaap_NetIncomeLoss $ 5,064us-gaap_NetIncomeLoss $ (14,950)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 3,972us-gaap_DepreciationDepletionAndAmortization 3,125us-gaap_DepreciationDepletionAndAmortization 3,527us-gaap_DepreciationDepletionAndAmortization
Provision for bad debt expense 64hill_ProvisionForDoubtfulAccountsExcludingDiscontinuedOperations 2hill_ProvisionForDoubtfulAccountsExcludingDiscontinuedOperations 25hill_ProvisionForDoubtfulAccountsExcludingDiscontinuedOperations
Share-based compensation expense 3,145us-gaap_ShareBasedCompensation 2,690us-gaap_ShareBasedCompensation 3,723us-gaap_ShareBasedCompensation
Long-lived assets impairment charge 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 1,647us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Write-off of property and equipment 63hill_LossOnWriteOffOfFixedAssets 23hill_LossOnWriteOffOfFixedAssets 244hill_LossOnWriteOffOfFixedAssets
Changes in operating assets and liabilities:      
Accounts receivable (859)us-gaap_IncreaseDecreaseInAccountsReceivable (17,931)us-gaap_IncreaseDecreaseInAccountsReceivable 6,621us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (4,845)us-gaap_IncreaseDecreaseInInventories (1,503)us-gaap_IncreaseDecreaseInInventories 213us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (3,682)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,618)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 1,740us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 2,962us-gaap_IncreaseDecreaseInAccountsPayable 11,100us-gaap_IncreaseDecreaseInAccountsPayable (7,474)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation and other expenses (1,783)us-gaap_IncreaseDecreaseInAccruedLiabilities 614us-gaap_IncreaseDecreaseInAccruedLiabilities (2,505)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue 1,122us-gaap_IncreaseDecreaseInDeferredRevenue 1,340us-gaap_IncreaseDecreaseInDeferredRevenue 2,017us-gaap_IncreaseDecreaseInDeferredRevenue
Other long-term liabilities (1,490)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 1,182us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 2,726us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by (used in) operating activities 6,724us-gaap_NetCashProvidedByUsedInOperatingActivities 4,088us-gaap_NetCashProvidedByUsedInOperatingActivities (2,446)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities:      
Purchases of property and equipment (4,156)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,644)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (6,152)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of intangible assets (1,990)us-gaap_PaymentsToAcquireIntangibleAssets 0us-gaap_PaymentsToAcquireIntangibleAssets 0us-gaap_PaymentsToAcquireIntangibleAssets
Proceeds from sale of property and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 74us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (6,146)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,644)us-gaap_NetCashProvidedByUsedInInvestingActivities (6,078)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows From Financing Activities:      
Principal payment of note payable 0us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt (71)us-gaap_RepaymentsOfLongTermDebt
Payments on bank borrowings (2,000)us-gaap_RepaymentsOfLinesOfCredit (7,700)us-gaap_RepaymentsOfLinesOfCredit (1,800)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from bank borrowings 0us-gaap_ProceedsFromLinesOfCredit 6,900us-gaap_ProceedsFromLinesOfCredit 4,600us-gaap_ProceedsFromLinesOfCredit
Shares withheld for tax purposes (95)hill_SharesWithheldForTaxPurposes (223)hill_SharesWithheldForTaxPurposes (590)hill_SharesWithheldForTaxPurposes
Proceeds from sale of stock to employees 3,676us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,062us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 756us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided by financing activities 1,581us-gaap_NetCashProvidedByUsedInFinancingActivities 39us-gaap_NetCashProvidedByUsedInFinancingActivities 2,895us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of Exchange Rate Changes on Cash and Cash Equivalents (73)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (392)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (224)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net Increase (Decrease) in Cash and Cash Equivalents 2,086us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 91us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (5,853)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, beginning of period 40,406us-gaap_CashAndCashEquivalentsAtCarryingValue 40,315us-gaap_CashAndCashEquivalentsAtCarryingValue 46,168us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, end of period 42,492us-gaap_CashAndCashEquivalentsAtCarryingValue 40,406us-gaap_CashAndCashEquivalentsAtCarryingValue 40,315us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Capital expenditures incurred but not yet paid 2,125us-gaap_CapitalExpendituresIncurredButNotYetPaid 398us-gaap_CapitalExpendituresIncurredButNotYetPaid 477us-gaap_CapitalExpendituresIncurredButNotYetPaid
Property and equipment transferred from inventory 42us-gaap_TransferToInvestments 0us-gaap_TransferToInvestments 0us-gaap_TransferToInvestments
Stock payment for employee bonus plan 0hill_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansBonusPlans 0hill_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansBonusPlans 1,005hill_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansBonusPlans
Supplemental Cash Flow Data:      
Cash paid for income taxes $ 254us-gaap_IncomeTaxesPaidNet $ 72us-gaap_IncomeTaxesPaidNet $ 116us-gaap_IncomeTaxesPaidNet