Income tax examination, preliminary tax assessment amount.

No definition available.

Name:	prcp_IncomeTaxExaminationPreliminaryTaxAssessmentAmount
Namespace Prefix:	prcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

Name:	us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

+ Details

Name:	us-gaap_LossContingencyAccrualPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=prcp_USEmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=prcp_TradeSecretsCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments And Contingencies (Narrative) (Details) $ in Thousands	1 Months Ended		3 Months Ended
	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Accrual related to settlement						$ 0
Preliminary tax assessment				$ 923,000	$ 1,218
Maximum [Member] \| U.S. Employee [Member]
Loss Contingencies [Line Items]
Interest and penalties			$ 300,000
Minimum [Member] \| U.S. Employee [Member]
Loss Contingencies [Line Items]
Accrual related to settlement			200,000
Interest and penalties			$ 200,000
Trade Secrets Case [Member]
Loss Contingencies [Line Items]
Judgment awarded		$ 675,000
Accrual related to settlement							$ 675,000
Net payments due to settlement with defendants	$ 66,000