LEASES -Schedule of maturities of operating lease liabilities (lease not yet commenced) (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Leases [Abstract]
2022 (remaining three months)	$ 81
2023	492
2024	493
2025	503
2026	505
Thereafter	443
Total future lease payments	$ 2,517

Lessee, Operating Lease, Lease Not Yet Commenced, Liability

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiability
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, Due After Year Four

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityDueAfterYearFour
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, Due Year Four

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityDueYearFour
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, Due Year One

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityDueYearOne
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, Due Year Three

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityDueYearThree
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, Due Year Two

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityDueYearTwo
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Lease Not Yet Commenced, Liability, Remainder Of Fiscal Year

No definition available.

Name:	pcrx_LesseeOperatingLeaseLeaseNotYetCommencedLiabilityRemainderOfFiscalYear
Namespace Prefix:	pcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.