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v3.19.3

Business Segments - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2019
Patient Experience Solutions [Member] |
Segment Reporting Information [Line Items] |
Date of business segment sold | Feb. 12, 2018

X
- Definition Date the entity disposed of a business or a group of assets, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DisposalDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=hstm_PatientExperienceSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |