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Business Combinations - Additional Information (Detail) (USD $)
12 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Business Acquisition [Line Items]          
Purchase price allocation for goodwill $ 41,914,000us-gaap_Goodwill   $ 35,746,000us-gaap_Goodwill $ 41,914,000us-gaap_Goodwill $ 29,299,000us-gaap_Goodwill
Net tangible assets include deferred revenue book value 3,200,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue     3,200,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue  
Net tangible assets include deferred revenue estimated fair value 1,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue     1,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue  
Write-down of deferred revenue 1,500,000hstm_WriteDownOfDeferredRevenue        
Health Care Compliance Strategies, Inc. [Member]          
Business Acquisition [Line Items]          
Acquisition date of assets Mar. 03, 2014        
Consideration paid for acquisition in cash 12,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
       
Consideration paid for acquisition in shares 81,614us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
       
Additional consideration paid for acquisition in cash 750,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    750,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Contingent upon achievement of certain financial targets and business outcome, term 1 year        
Transaction related costs 515,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    515,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Purchase price allocation for goodwill 6,200,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    6,200,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Purchase price allocation for identifiable intangible assets 8,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    8,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Purchase price allocation for net tangible assets 2,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    2,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Transaction costs associated with the HCCS acquisition   365,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
150,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
   
Purchase price allocation for deferred tax assets 625,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    625,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Purchase price allocation for liabilities 2,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    2,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Accrual for contingent consideration 600,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
    600,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= hstm_HealthCareComplianceStrategiesIncMember
 
Decision Critical, Inc. [Member]          
Business Acquisition [Line Items]          
Acquisition date of assets Jun. 29, 2012        
Consideration paid for acquisition in cash 3,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
       
Consideration paid for acquisition in shares 22,124us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
       
Additional consideration paid for acquisition in cash 300,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    300,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Contingent upon achievement of certain financial targets and business outcome, term 3 years        
Consideration paid for acquisition       188,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Transaction related costs 203,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    203,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Purchase price allocation for goodwill 2,900,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    2,900,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Purchase price allocation for identifiable intangible assets 1,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    1,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Purchase price allocation for net tangible assets 291,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    291,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Purchase price allocation for deferred tax liabilities 456,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    456,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Net tangible assets include deferred revenue book value 548,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    548,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Net tangible assets include deferred revenue estimated fair value 356,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
    356,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
 
Write-down of deferred revenue 192,000hstm_WriteDownOfDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_DecisionCriticalMember
       
Sy. Med Development, Inc. [Member]          
Business Acquisition [Line Items]          
Acquisition date of assets Oct. 19, 2012        
Consideration paid for acquisition in cash 7,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
       
Consideration paid for acquisition in shares 34,060us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
       
Consideration paid for acquisition 1,250,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
       
Transaction related costs 165,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    165,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Purchase price allocation for goodwill 5,400,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    5,400,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Purchase price allocation for identifiable intangible assets 6,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    6,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Purchase price allocation for net tangible assets 294,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    294,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Purchase price allocation for deferred tax liabilities 2,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    2,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Net tangible assets include deferred revenue book value 1,100,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    1,100,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Net tangible assets include deferred revenue estimated fair value 229,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
    229,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
 
Write-down of deferred revenue 916,000hstm_WriteDownOfDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_SyMedDevelopmentMember
       
Baptist Leadership Group [Member]          
Business Acquisition [Line Items]          
Acquisition date of assets Sep. 09, 2013        
Consideration paid for acquisition in cash 7,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
       
Consideration paid for acquisition in shares 15,230us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
       
Transaction related costs 145,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
    145,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
 
Purchase price allocation for goodwill 6,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
    6,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
 
Purchase price allocation for identifiable intangible assets 1,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
    1,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
 
Purchase price allocation for net tangible assets 28,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
    28,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
 
Net tangible assets include deferred revenue book value 508,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
    508,000hstm_NetTangibleAssetsIncludeDeferredRevenueBookValue
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
 
Net tangible assets include deferred revenue estimated fair value 254,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
    254,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember
 
Write-down of deferred revenue $ 254,000hstm_WriteDownOfDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= hstm_BaptistLeadershipGroupMember