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Balance Sheet Components - Additional Information (Details) $ in Millions			9 Months Ended
	Jul. 10, 2025 USD ($)	Feb. 14, 2025 USD ($) ft²	Sep. 30, 2025 USD ($)
Inventory Disclosure [Abstract]
Number of square feet | ft²		330,000
Expected cost	$ 23.0	$ 35.0
Payments to acquire buildings			$ 21.5
Payments for capital improvements			$ 6.8

X

- Definition

Number of Square Feet

+ References

No definition available.

+ Details

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Namespace Prefix:	pen_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Payments To Acquire Buildings, Expected

+ References

No definition available.

+ Details

Name:	pen_PaymentsToAcquireBuildingsExpected
Namespace Prefix:	pen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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Period Type:	duration

X

- Definition

The cash outflow for acquisition of buildings (properties) whether for investment or use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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