Overview	12 Months Ended
Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Overview	Note 1 — Overview Gentherm Incorporated is a global developer and marketer of innovative thermal management technologies for a broad range of heating and cooling and temperature control applications. Unless the context otherwise requires, the terms “Gentherm”, “Company”, “we”, “us” and “our” used herein refer to Gentherm Incorporated and its consolidated subsidiaries. Our products provide solutions for automotive passenger climate comfort and convenience, battery thermal management and cell connecting systems, as well as patient temperature management within the health care industry. Our automotive products can be found on the vehicles of nearly all major automotive manufacturers operating in North America and Europe and several major automotive manufacturers in Asia. We operate in locations aligned with our major customers’ product strategies to provide locally enhanced design, integration and production capabilities. The Company is also developing a number of new technologies and products that is expected to help enable improvements to existing products and to create new product applications for existing and new markets. On February 1, 2019, the Company completed the divestiture of its environmental test equipment business, Cincinnati Sub Zero industrial chamber business (“CSZ-IC”) and on October 1, 2019, the Company completed the divestiture of its remote power generation systems business, Gentherm Global Power Technologies (“GPT”). The Company’s consolidated financial statements herein include the results of CSZ-IC and GPT through their respective dates of divestiture. CSZ-IC and GPT are not subject to discontinued operations classification. Impact of COVID-19 The COVID-19 pandemic has significantly disrupted global economic activity, including the automotive market. The COVID-19 pandemic was first identified in China around December 2019. The impact of the outbreak quickly expanded beyond China and its surrounding region and has significantly and adversely impacted the entire global economy and automotive market in 2020. During the first quarter of 2020, customer plants in North America and Europe were closed beginning in the second half of March due to the pandemic. This resulted in temporary, partial closures of several of our manufacturing facilities in North America and Europe by the end of March 2020. Customer plants and our manufacturing facilities in Asia were closed for several weeks in February and operated at reduced volumes in March, resuming production to near full capacity by the end of the first quarter, which continued throughout the second quarter. However, during the second quarter of 2020, our manufacturing facilities in North America and Europe remained closed until the last week in May due to the pandemic, gradually resuming production to near full capacity in North America, and to about 70% capacity in Europe by the end of June. During the second half of 2020, our customers’ plants were open, and our production volumes were stronger than pre-COVID levels at our manufacturing facilities. The Company has implemented additional health and safety precautions and protocols in response to the pandemic and government guidelines to help ensure the safety and health of all its employees, and it continues to assess and update business continuity plans in the context of this pandemic. The consequences of the pandemic and adverse impact to the economy continue to evolve and the future adverse impact on our business and financial statements remains subject to significant uncertainty as of the date of this filing.

Overview

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Note 1 — Overview

Gentherm Incorporated is a global developer and marketer of innovative thermal management technologies for a broad range of heating and cooling and temperature control applications. Unless the context otherwise requires, the terms “Gentherm”, “Company”, “we”, “us” and “our” used herein refer to Gentherm Incorporated and its consolidated subsidiaries. Our products provide solutions for automotive passenger climate comfort and convenience, battery thermal management and cell connecting systems, as well as patient temperature management within the health care industry. Our automotive products can be found on the vehicles of nearly all major automotive manufacturers operating in North America and Europe and several major automotive manufacturers in Asia. We operate in locations aligned with our major customers’ product strategies to provide locally enhanced design, integration and production capabilities. The Company is also developing a number of new technologies and products that is expected to help enable improvements to existing products and to create new product applications for existing and new markets.

On February 1, 2019, the Company completed the divestiture of its environmental test equipment business, Cincinnati Sub Zero industrial chamber business (“CSZ-IC”) and on October 1, 2019, the Company completed the divestiture of its remote power generation systems business, Gentherm Global Power Technologies (“GPT”). The Company’s consolidated financial statements herein include the results of CSZ-IC and GPT through their respective dates of divestiture. CSZ-IC and GPT are not subject to discontinued operations classification.

Impact of COVID-19

The COVID-19 pandemic has significantly disrupted global economic activity, including the automotive market. The COVID-19 pandemic was first identified in China around December 2019. The impact of the outbreak quickly expanded beyond China and its surrounding region and has significantly and adversely impacted the entire global economy and automotive market in 2020. During the first quarter of 2020, customer plants in North America and Europe were closed beginning in the second half of March due to the pandemic. This resulted in temporary, partial closures of several of our manufacturing facilities in North America and Europe by the end of March 2020. Customer plants and our manufacturing facilities in Asia were closed for several weeks in February and operated at reduced volumes in March, resuming production to near full capacity by the end of the first quarter, which continued throughout the second quarter. However, during the second quarter of 2020, our manufacturing facilities in North America and Europe remained closed until the last week in May due to the pandemic, gradually resuming production to near full capacity in North America, and to about 70% capacity in Europe by the end of June. During the second half of 2020, our customers’ plants were open, and our production volumes were stronger than pre-COVID levels at our manufacturing facilities. The Company has implemented additional health and safety precautions and protocols in response to the pandemic and government guidelines to help ensure the safety and health of all its employees, and it continues to assess and update business continuity plans in the context of this pandemic. The consequences of the pandemic and adverse impact to the economy continue to evolve and the future adverse impact on our business and financial statements remains subject to significant uncertainty as of the date of this filing.