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Note 8 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Term Loan [Member] - Tang Capital [Member] - USD ($)	Aug. 05, 2016	Aug. 02, 2016
Debt Agreement, Maximum Borrowing Capacity		$ 100,000,000
Debt Instrument, Term		2 years
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Proceeds from Issuance of Long-term Debt	$ 50,000,000
Debt Instrument, Fee Amount	$ 0
Debt Instrument, Number of Warrants	0
Proceeds from Issuance of Long-term Debt, Subject to Achievement of Corporate Milestone		$ 50,000,000
Debt Instrument, Convertible, Beneficial Conversion Feature	$ 0

X

- Definition

Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of warrants that accompanies borrowing money under the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow from a debt that is subject to the achievement of a corporate milestone.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Beneficial Conversion Feature
-URI http://asc.fasb.org/extlink&oid=6505963

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X

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	na
Period Type:	instant

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Details

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- Details

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- Details

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