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Summary of Significant Accounting Policies - Revenue and Cost of Product Sales (Details)	9 Months Ended
	Sep. 30, 2025
Accounting Policies [Abstract]
Period of contract termination by written notice	90 days

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- Definition

Revenue, Remaining Performance Obligation, Period Of Termination By Written Notice

+ References

No definition available.

+ Details

Name:	halo_RevenueRemainingPerformanceObligationPeriodOfTerminationByWrittenNotice
Namespace Prefix:	halo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration