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Revenue Recognition - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Revenue Recognition And Deferred Revenue [Abstract]
Aggregate amount of transaction price allocated to material rights that remain unsatisfied under LTAs	$ 579
Revenue expected to be recognized in 2020	69.00%
Revenue expected to be recognized in 2021	11.00%
Revenue expected to be recognized in 2022	11.00%
Revenue expected to be recognized in 2023	9.00%

X

- Definition

Deferred revenue expected to be recognized in the next twelve months.

+ References

No definition available.

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X

- Definition

Deferred revenue expected to be recognized in year four.

+ References

No definition available.

+ Details

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X

- Definition

Deferred revenue expected to be recognized in year three.

+ References

No definition available.

+ Details

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X

- Definition

Deferred revenue expected to be recognized in year two.

+ References

No definition available.

+ Details

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Namespace Prefix:	thrm_
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- References

No definition available.

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X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045

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