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Note 5 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 5 - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Rent Expense	$ 1,381,000us-gaap_LeaseAndRentalExpense	$ 967,000us-gaap_LeaseAndRentalExpense	$ 580,000us-gaap_LeaseAndRentalExpense
Purchase Obligation	877,000us-gaap_PurchaseObligation
Unrecorded Unconditional Purchase Obligation	$ 218,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Redwood City [Member]
Note 5 - Commitments and Contingencies (Details) [Line Items]
Area of Real Estate Property (in Square Feet)	26,067us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = hrtx_RedwoodCityMember
Stamford [Member]
Note 5 - Commitments and Contingencies (Details) [Line Items]
Area of Real Estate Property (in Square Feet)	1,400us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = hrtx_StamfordMember
San Diego [Member]
Note 5 - Commitments and Contingencies (Details) [Line Items]
Area of Real Estate Property (in Square Feet)	2,020us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = hrtx_SanDiegoMember

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Area of a real estate property.

+ References

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

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