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Note 5 - Stockholders' Equity - Allocation of the Recognized Cost (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based compensation expense	$ 2,551us-gaap_AllocatedShareBasedCompensationExpense	$ 2,969us-gaap_AllocatedShareBasedCompensationExpense
Impact on basic and diluted net loss per share (in dollars per share)	$ 0.09hrtx_ImpactOnBasicAndDilutedNetLossPerCommonShareInDollarsPerShare	$ 0.13hrtx_ImpactOnBasicAndDilutedNetLossPerCommonShareInDollarsPerShare
Research and Development Expense [Member]
Share-based compensation expense	806us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	1,262us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
General and Administrative Expense [Member]
Share-based compensation expense	$ 1,745us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 1,707us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition

Impact on basic and diluted net loss per common share in dollars per shar

+ References

No definition available.

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X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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