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Restricted Cash (Narrative) (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Cash and Cash Equivalents [Abstract]
Restricted cash released	$ 2,127

X

- Definition

Restricted Cash Released

+ References

No definition available.

+ Details

Name:	ipgp_RestrictedCashReleased
Namespace Prefix:	ipgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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