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Note 3 - Accounting Policies - Summary of Product Sales Allowance (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Balance	$ 25,503
Provision	34,799
Payments/credits	(26,237)
Balance	34,065
Allowance for Sales Returns 1 [Member]
Balance	947
Provision	332
Payments/credits	(3)
Balance	1,276
Allowance for Distributor Fees [Member]
Balance	2,813
Provision	3,825
Payments/credits	(3,289)
Balance	3,349
Allowance for Rebates and Chargebacks [Member]
Balance	21,743
Provision	30,642
Payments/credits	(22,945)
Balance	$ 29,440

X

- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from provisions of amounts previously written off or reestablishment of reserves that had previously been utilized.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrtx_
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Balance Type:	credit
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X

- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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X

- Definition

Amount of decrease in valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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X

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