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Significant Customers and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Customer
Dec. 31, 2013
Jun. 30, 2014
Customers One [Member]
Jun. 30, 2013
Customers One [Member]
Jun. 30, 2014
Customers One [Member]
Sales [Member]
Jun. 30, 2013
Customers One [Member]
Sales [Member]
Jun. 30, 2014
Customers One [Member]
Sales [Member]
Jun. 30, 2013
Customers One [Member]
Sales [Member]
Jun. 30, 2014
Customers Two [Member]
Jun. 30, 2013
Customers Two [Member]
Jun. 30, 2014
Customers Two [Member]
Sales [Member]
Jun. 30, 2013
Customers Two [Member]
Sales [Member]
Jun. 30, 2014
Customers Two [Member]
Sales [Member]
Jun. 30, 2013
Customers Two [Member]
Sales [Member]
Jun. 30, 2014
Customers Three [Member]
Jun. 30, 2013
Customers Three [Member]
Jun. 30, 2014
Customers Three [Member]
Sales [Member]
Jun. 30, 2013
Customers Three [Member]
Sales [Member]
Jun. 30, 2014
Customers Three [Member]
Sales [Member]
Jun. 30, 2013
Customers Three [Member]
Sales [Member]
Jun. 30, 2014
BASF [Member]
Jun. 30, 2014
BASF [Member]
Maximum [Member]
Jun. 30, 2014
BASF [Member]
Minimum [Member]
Revenue, Major Customer [Line Items]                                              
Number of major customers 3                                            
Revenue from top customers         68.00% 62.00% 74.00% 71.00%     10.00% 11.00% 5.00% 5.00%     6.00% 9.00% 6.00% 8.00%      
Accounts receivable $ 988,000 $ 52,000 $ 632,000 $ 845,000         $ 0 $ 284,000         $ 171,000 $ 243,000              
Supply agreements with BASF Corporation                                         The most restrictive financial 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 of 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.    
Cash, cash equivalents and investments, maximum                                           1,000,000  
Minimum contractual covenant - net earnings previous twelve months                                         0    
Principal amount of debt on maturity, minimum                                             $ 10,000,000
Net book value equipment                                         115.00%    
Original book value of equipment, Minimum                                             30.00%