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LEASES - Narrative (Details) | 9 Months Ended
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Sep. 30, 2021 segment
Leases [Abstract] |
Term of contract | 8 years 10 months 24 days
Number of leases not yet commenced | 1

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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Number Of Contracts + References No definition available. + Details
Name: | pcrx_LesseeOperatingLeaseLeaseNotYetCommencedNumberOfContracts
Namespace Prefix: | pcrx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant