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Note 11 - Defined Contribution Plan (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% | 50.00% | 50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% | 3.00% | 3.00%
Defined Contribution Plan Employer Matching Contribution Amount | $ 7,650 | $ 7,500 | $ 7,350
Defined Benefit Plan, Contributions by Employer | 134,000 | 71,000 | 46,000
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 |  |

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- Definition Maximum dollar amount of employee gross pay the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | hrtx_DefinedContributionPlanEmployerMatchingContributionAmount
Namespace Prefix: | hrtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration