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Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Apr. 01, 2014
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life Term of lease  
Global Thermoelectric Inc    
Property Plant And Equipment [Line Items]    
Property and equipment $ 716 $ 716
Global Thermoelectric Inc | Land    
Property Plant And Equipment [Line Items]    
Property and equipment $ 15  
Property and equipment, Useful life Indefinite  
Global Thermoelectric Inc | Buildings    
Property Plant And Equipment [Line Items]    
Property and equipment $ 81  
Property and equipment, Useful life 20 years  
Global Thermoelectric Inc | Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment $ 28  
Global Thermoelectric Inc | Leasehold improvements | Minimum    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life 5 years  
Global Thermoelectric Inc | Leasehold improvements | Maximum    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life 7 years  
Global Thermoelectric Inc | Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment $ 423  
Global Thermoelectric Inc | Machinery and Equipment | Minimum    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life 2 years  
Global Thermoelectric Inc | Machinery and Equipment | Maximum    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life 5 years  
Global Thermoelectric Inc | Computer Hardware and Software    
Property Plant And Equipment [Line Items]    
Property and equipment $ 169  
Global Thermoelectric Inc | Computer Hardware and Software | Minimum    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life 3 years  
Global Thermoelectric Inc | Computer Hardware and Software | Maximum    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful life 5 years