Summary of Significant Accounting Policies - Revenue and Cost of Product Sales (Details)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Period of contract termination by written notice	90 days

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

No definition available.

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