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Note 9 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Office and Laboratory Space Lease with AP3-SD1 Campus Point LLC [Member] $ in Millions	Oct. 18, 2016 USD ($)
Lessee Leasing Arrangements, Operating Leases, Term of Contract	7 years 136 days
Operating Leases, Base Annual Rent Expense, Initial Year	$ 1.3
Operating Leases, Base Annual Rent Expense, Final Year	1.6
Payments for Deposits	$ 0.1
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years

X

- Definition

Amount of base annual rent expense for the last year of the lease.

+ References

No definition available.

+ Details

Name:	hrtx_OperatingLeasesBaseAnnualRentExpenseFinalYear
Namespace Prefix:	hrtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of base annual rent expense for the first twelve months of the lease.

+ References

No definition available.

+ Details

Name:	hrtx_OperatingLeasesBaseAnnualRentExpenseInitialYear
Namespace Prefix:	hrtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash paid for deposits on goods and services during the period; excludes time deposits and deposits with other institutions, which pertain to financial service entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForDeposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=hrtx_OfficeAndLaboratorySpaceLeaseWithAP3SD1CampusPointLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: