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Amount of lease liability.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Rent expense.

No definition available.

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Namespace Prefix:	prso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Indicates line item in statement of financial position that includes finance lease liability.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
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-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-2

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Indicates line item in statement of financial position that includes finance lease right-of-use asset.

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Amount of incentive granted by lessor to lessee.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Discount rate used by lessee to determine present value of operating lease payments.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Period Type:	instant

Amount of the required periodic payments of both interest and principal.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Indicates line item in statement of financial position that includes operating lease liability.

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Amount of lessee's right to use underlying asset under operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
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-Name Accounting Standards Codification
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Indicates line item in statement of financial position that includes operating lease right-of-use asset.

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States the combined aggregate amount of maturities and sinking fund requirements for a long-term unconditional purchase obligation that has been recognized on the balance sheet.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The value of assets other than financial instruments pledged to provide security to a suppler under a recorded unconditional purchase obligation arrangement.

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-Name Accounting Standards Codification
-Topic 860
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