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Organization (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2013
Subsequent Event [Member]
Scenario, Previously Reported [Member]
8% Shareholder Note Due 2015 [Member]
Dec. 31, 2012
Subsequent Event [Member]
Scenario, Previously Reported [Member]
6% Shareholder Note Due 2013 [Member]
Jun. 30, 2013
Subsequent Event [Member]
Scenario, Previously Reported [Member]
6% Shareholder Note Due 2013 [Member]
Jun. 30, 2013
Subsequent Event [Member]
Scenario, Forecast [Member]
8% Shareholder Note Due 2015 [Member]
Dec. 31, 2012
Subsequent Event [Member]
Scenario, Forecast [Member]
6% Shareholder Note Due 2013 [Member]
Jun. 30, 2013
Subsequent Event [Member]
6% Shareholder Note Due 2013 [Member]
Jan. 30, 2013
Subsequent Event [Member]
6% Shareholder Note Due 2013 [Member]
Dec. 31, 2012
Purchase Agreementwith LPC [Member]
Minimum [Member]
Dec. 31, 2012
Purchase Agreementwith LPC [Member]
Maximum [Member]
Dec. 31, 2012
Purchase Agreementwith LPC [Member]
Oct. 07, 2011
Purchase Agreementwith LPC [Member]
Dec. 31, 2012
Purchase At Full Capacity [Member]
Dec. 31, 2012
Purchase At Exchange Cap [Member]
Dec. 31, 2012
Shelf Registration [Member]
May 21, 2012
Shelf Registration [Member]
Dec. 31, 2012
Minimum [Member]
6% Shareholder Note Due 2013 [Member]
Dec. 31, 2012
Maximum [Member]
6% Shareholder Note Due 2013 [Member]
Jul. 27, 2012
8% Shareholder Note Due 2015 [Member]
Jun. 30, 2013
6% Shareholder Note Due 2013 [Member]
Jan. 30, 2013
6% Shareholder Note Due 2013 [Member]
Mar. 31, 2011
6% Shareholder Note Due 2013 [Member]
Dec. 31, 2012
Secured Demand Facility [Member]
Retained Earnings (Accumulated Deficit) $ (174,621,000) $ (164,961,000)                                              
Line of Credit Facility, Maximum Borrowing Capacity 7,500,000                                               7,500,000
Line of Credit Facility, Amount Outstanding                                                 5,500,000
Line of Credit Facility, Remaining Borrowing Capacity                                                 2,000,000
Stock Purchase Agreement Period In Force                         30 months                        
Stock Purchase Agreement Authorized Amount (in Dollars)                         10,000,000 10,000,000       50,000,000              
Sale of Stock Maximum Sale Per Transaction (in Dollars)                     500,000 1,500,000                          
Stock Purchase Agreement Exchange Cap (in Shares)                         1,434,994                        
Stock Purchase Agreement Exchange Rate Cap                         19.99%                        
Debt Instrument, Convertible, Conversion Price (in Dollars per share)                         $ 3.014                        
Share Price (in Dollars per share)                         $ 2.17                        
Stock Purchase Agreement Remaining Number of Shares Authorized to be Sold (in Shares)                         1,702,836                        
Assumed Proceeds From Sale Of Common Stock                             3,700,000 3,100,000                  
Aggregate Offering Price Of Common Stock                                 50,000,000                
Notes Payable, Noncurrent 7,478,000 4,520,000                                     3,000,000        
Debt Instrument, Interest Rate, Stated Percentage       8.00%   6.00% 8.00%                           8.00%   6.00% 6.00%  
Debt Instrument Premium Payment         100,000     200,000                     100,000 200,000          
Debt Instrument Payment Premium Converted To Fixed Amount                   250,000                         250,000    
Debt Instrument First Payable Amount On Conversion Of Debt Premium To Fixed Amount                 100,000                         100,000      
Cash (in Dollars) $ 6,878,000 $ 3,471,000 $ 5,007,000