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Deferred Engineering Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Deferred Costs [Abstract]
Deferred engineering costs	$ 109,940	$ 106,425

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- Definition

Deferred Engineering Costs

+ References

No definition available.

+ Details

Name:	tell_DeferredEngineeringCosts
Namespace Prefix:	tell_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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