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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2017
Revenue Recognition
Beginning period prior to product expiration allowed for the product to be returned	6 months
Period following product expiration upto which the product is allowed to be returned	12 months

X

- Definition

Represents the beginning period prior to the product expiration, which the entity allows for the product to be returned.

+ References

No definition available.

+ Details

Name:	pcrx_BeginningPeriodPriorToProductExpirationAllowedForReturningProduct
Namespace Prefix:	pcrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period following the product expiration, upto which the entity allows for the product to be returned.

+ References

No definition available.

+ Details

Name:	pcrx_PeriodAfterProductExpirationUptoWhichProductIsAllowedToBeReturned
Namespace Prefix:	pcrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration