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Fair Value Measurement - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Jul. 13, 2015
May. 28, 2015
Schedule Of Fair Value Measurement Details [Line Items]        
Fair value of the derivative asset $ 0     $ 420
Fair value of remaining equity interest 20.00%      
Fair value of derivative asset $ 2,328      
Change in fair value of derivative asset/liability 15,650 $ (972)    
Estimate of Fair Value        
Schedule Of Fair Value Measurement Details [Line Items]        
Convertible debt, fair value disclosures 54,315 39,423    
Fair value of derivative asset 2,328      
EnSync, Inc        
Schedule Of Fair Value Measurement Details [Line Items]        
Equity method investment 1,841   $ 3,244  
Investment in ENS's Convertible Preferred Stock 12,109   $ 13,199  
Fair value of derivative asset 16,947      
Other income (expense)        
Schedule Of Fair Value Measurement Details [Line Items]        
Change in fair value of derivative asset/liability 14,619      
Fair Value, Inputs, Level 2        
Schedule Of Fair Value Measurement Details [Line Items]        
Convertible debt, fair value disclosures 54,315 $ 39,423    
Fair Value, Inputs, Level 1 | EnSync, Inc | Estimate of Fair Value        
Schedule Of Fair Value Measurement Details [Line Items]        
Equity method investment, fair value 3,040      
Fair Value, Inputs, Level 3 | EnSync, Inc | Estimate of Fair Value        
Schedule Of Fair Value Measurement Details [Line Items]        
Investment in ENS's Convertible Preferred Stock, fair value $ 12,109