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ACQUISITIONS USSI (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Nov. 01, 2012
Jul. 30, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
years
Feb. 09, 2011
Jan. 25, 2011
Business Acquisition [Line Items]                
Investment Owned, Balance, Shares           1,155,160    
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions     93.60%          
Preferred stock purchase USSI $ 2,500 $ 2,500   $ 2,500        
Cumulative Percentage Ownership after All Transactions 94.40%              
fully diluted ownership 85.10%     71.40%        
Noncontrolling Interest, Ownership Percentage by Parent           65.60% 80.60%  
Cash amount invested in subsidiary as of the balance sheet date           1,500    
Value of the Company’s common stock used to acquire shares of a subsidiary.           2,229    
Additional investment by parent company in subsidiary via exercise of options to increase the parent’s investment             750 250
Potential investment amount through exercise of Acorn’s option to invest in USSI.         1,500      
Acorn’s potential holding in USSI if the final option to invest in USSI would have been exercised         87.40%      
Preferred stock purchase USSI - April 2012       2,250        
Parent’s percentage of ownership in subsidiary, following second closing for the purchase of additional stock in accordance with the USSI purchase agreement       92.00%        
Amount advanced by parent company in contemplation of a new investment agreement         2,000      
Net loss attributable to NCI in USSI       1,108 571 776    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests       1,067 600 2,224    
Estimated fair market value of the acquired technology           $ 2,565    
Weighted average estimated useful life in years of the acquired technology           20