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Discontinued Operations - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended
Feb. 27, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups [Line Items]              
Proceeds from sale of assets $ 756,000            
Period of earnout payments       30 days      
Percentage of earnout payments in first quarter       6.00%      
Percentage of earnout payments in second quarter       4.00%      
Percentage of earnout payments in third quarter       2.00%      
Other receivables       45,000      
Income from earnout payments   45,000   92,000   157,000  
Warranty reserves related to discontinued operations   5,000   5,000   5,000 21,000
Warranty reserves related to discontinued operations reversal of warranty reserves   8,000   16,000      
Warranty reserves related to discontinued operations warranty expenses     5,000   11,000    
Aggregate carrying amount of land and building to estimated fair value   $ 733,000   $ 733,000   $ 733,000 $ 733,000