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Note 9 - Employee Benefit Plan (Details Textual) - USD ($) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Maximum [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% | 3.00% | 3.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% | 50.00% | 50.00% |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  |  |  | $ 0
Defined Contribution Plan, Maximum Annual Contributions by Employer per Employee, Amount | $ 7,950 | $ 7,800 | $ 7,650 |
Defined Contribution Plan, Cost Recognized | $ 251,000 | $ 181,000 | $ 134,000 |

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- Definition Maximum amount per each participant the employer may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | hrtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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
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Namespace Prefix: | us-gaap_
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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Period Type: |