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Contractual Adjustment - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
Contractual Adjustment [Abstract] |
Cost of goods and services sold, derecognized | $ 3.4

X
- Definition Contractual adjustment. + References No definition available. + Details
Name: | hstm_ContractualAdjustmentAbstract
Namespace Prefix: | hstm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Cost of goods and services sold, derecognized. + References No definition available. + Details
Name: | hstm_CostOfGoodsAndServicesSoldDerecognized
Namespace Prefix: | hstm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration