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v2.4.1.9

Note 9 - Employee Benefit Plan (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 9 - Employee Benefit Plan (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Defined Contribution Plan, Maximum Annual Contributions by Employer, Per Employee, Amount | $ 7,800 hrtx_DefinedContributionPlanMaximumAnnualContributionsByEmployerPerEmployeeAmount | $ 7,650 hrtx_DefinedContributionPlanMaximumAnnualContributionsByEmployerPerEmployeeAmount | $ 7,500 hrtx_DefinedContributionPlanMaximumAnnualContributionsByEmployerPerEmployeeAmount
Defined Contribution Plan, Cost Recognized | 181,000 us-gaap_DefinedContributionPlanCostRecognized | 134,000 us-gaap_DefinedContributionPlanCostRecognized | 71,000 us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount |  |
Maximum [Member] |  |  |
Note 9 - Employee Benefit Plan (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Maximum amount per each participant the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | hrtx_DefinedContributionPlanMaximumAnnualContributionsByEmployerPerEmployeeAmount
Namespace Prefix: | hrtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | hrtx_Note9EmployeeBenefitPlanDetailsLineItems
Namespace Prefix: | hrtx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
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

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- 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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |