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Supplemental Balance Sheet Disclosures - Deferred Revenue (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) item | Sep. 30, 2021 USD ($) item | Dec. 31, 2021 USD ($) item
Deferred Revenue |  |  |
Amount of license fees not yet recognized under the Co-Promotion Agreement, included in deferred revenue | $ 200 |  | $ 200
Amount of deferred revenue related to the fair value of the remaining poNS devices to be transferred that had been included as consideration in the Company's acquisition of Heuro |  |  | $ 100
Number of devices recorded as deferred revenue | item |  |  | 16
Amount of deferred revenue recognized related to Product Sales | $ 100 | $ 30 |
Number Of Devices Resulted In Recognition Of Revenue | item | 16 | 4 |

X
- Definition The amount of license fees not yet recognized included in deferred revenue. + References No definition available. + Details
Name: | hsdt_DeferredLicenseRevenueNotYetRecognized
Namespace Prefix: | hsdt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of deferred revenue related to the fair value of the remaining poNS devices to be transferred that had been included as consideration in the Company's acquisition of a business. + References No definition available. + Details
Name: | hsdt_DeferredRevenueProductSales
Namespace Prefix: | hsdt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of deferred revenue recognized related to Product Sales. + References No definition available. + Details
Name: | hsdt_DeferredRevenueRecognizedProductSales
Namespace Prefix: | hsdt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of devices resulted in recognition of revenue. + References No definition available. + Details
Name: | hsdt_NumberOfDevicesResultedInRecognitionOfRevenue
Namespace Prefix: | hsdt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of remaining devices recorded as deferred revenue. + References No definition available. + Details
Name: | hsdt_NumberOfRemainingDevicesRecordedAsDeferredRevenue
Namespace Prefix: | hsdt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DeferredRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration