Property, Plant and Equipment - Depreciation (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 289,336	$ 39,543	$ 330,808	$ 83,171

Depreciation, Depletion and Amortization, Property, Plant and Equipment

No definition available.

Name:	tgen_DepreciationDepletionandAmortizationPropertyPlantandEquipment
Namespace Prefix:	tgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration