Summary of Property and Equipment (Detail) (Global Thermoelectric Inc, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Property Plant And Equipment [Line Items]
Property and equipment	$ 716
Land
Property Plant And Equipment [Line Items]
Property and equipment	15
Property and equipment, Useful Life	Indefinite
Buildings
Property Plant And Equipment [Line Items]
Property and equipment	81
Property and equipment, Useful Life	20 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment	28
Leasehold Improvements | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	5 years
Leasehold Improvements | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	7 years
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment	423
Machinery and Equipment | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	2 years
Machinery and Equipment | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	5 years
Computer Hardware and Software
Property Plant And Equipment [Line Items]
Property and equipment	$ 169
Computer Hardware and Software | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	3 years
Computer Hardware and Software | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	5 years