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Significant Customers and Contingencies - Additional Information (Detail)
3 Months Ended
Mar. 31, 2016
USD ($)
Customer
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Revenue, Major Customer [Line Items]      
Number of major customers | Customer 3    
Accounts receivable $ 929,000   $ 507,000
Customers One [Member]      
Revenue, Major Customer [Line Items]      
Accounts receivable $ 517,000 $ 578,000  
Customers One [Member] | Customer Concentration Risk [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Revenue from top customers 71.00% 59.00%  
Customers Two [Member]      
Revenue, Major Customer [Line Items]      
Accounts receivable $ 144,000 $ 259,000  
Customers Two [Member] | Customer Concentration Risk [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Revenue from top customers 7.00% 7.00%  
Customers Three [Member]      
Revenue, Major Customer [Line Items]      
Accounts receivable $ 88,000 $ 109,000  
Customers Three [Member] | Customer Concentration Risk [Member] | Sales [Member]      
Revenue, Major Customer [Line Items]      
Revenue from top customers 4.00% 8.00%  
BASF [Member]      
Revenue, Major Customer [Line Items]      
Supply agreements with BASF Corporation The financial condition covenants in one of our supply agreements with BASF "trigger" a technology transfer right (license and equipment sale at BASF's option) in the event (a) that earnings for the twelve month period ending with our most recently published quarterly financial statements are less than zero and our cash, cash equivalents and certain investments are less than $1 million, or (b) of an acceleration of any debt maturity having a principal amount of more than $10 million.    
Minimum contractual covenant - net earnings previous twelve months $ 0    
Net book value equipment 115.00%    
BASF [Member] | Maximum [Member]      
Revenue, Major Customer [Line Items]      
Cash, cash equivalents and investments, maximum $ 1,000,000    
BASF [Member] | Minimum [Member]      
Revenue, Major Customer [Line Items]      
Principal amount of debt on maturity, minimum $ 10,000,000    
Original book value of equipment, Minimum 30.00%