Short-Term And Long-Term Investments (Schedule Of Short-Term And Long-Term Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	$ 741	$ 877
Long-term investments	725	725
Total Investments	1,466	1,602
Bank Guarantees [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	276	166
Preferred Stock [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Long-term investments	725
Cost [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	741	877
Long-term investments	3,700	3,700
Total Investments	4,441	4,577
Cost [Member] \| Bank Guarantees [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	276	166
Cost [Member] \| Mutual Funds [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	13	23
Cost [Member] \| Time/Fixed Deposits [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	452	688
Cost [Member] \| Preferred Stock [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Long-term investments	3,700	3,700
Fair Value Or Carrying Value [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	741	877
Long-term investments	725	725
Total Investments	1,466	1,602
Fair Value Or Carrying Value [Member] \| Bank Guarantees [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	276	166
Fair Value Or Carrying Value [Member] \| Mutual Funds [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	13	23
Fair Value Or Carrying Value [Member] \| Time/Fixed Deposits [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	452	688
Fair Value Or Carrying Value [Member] \| Preferred Stock [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Long-term investments	$ 725	$ 725

Investments, Debt and Equity Securities Statement [Line Items]

No definition available.

Name:	prcp_InvestmentsDebtAndEquitySecuritiesStatementLineItems
Namespace Prefix:	prcp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_Investments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(g))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_ShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_InvestmentTypeAxis=prcp_BankGuaranteesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_PreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MutualFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_BankTimeDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: