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EQUITY - DSIT Option Plan by Exercise Price Range (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Nov. 01, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Equity [Abstract]            
Acorn percentage holdings in DSIT     84.00%      
fully diluted ownership 85.10%   71.40%      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions   93.60%        
Options, Outstanding, Number - DSIT Option Plan     238,764 240,824 152,400 152,400
Options, Outstanding, Weighted Average Exercise Price - DSIT Option Plan     $ 1.69 $ 1.67 $ 1.18 $ 1.18
Exerciseable, Number - DSIT Option Plan     0 0 0  
Exercisable Options, Weighted Average Exercise Price - DSIT Option Plan     $ 0 $ 0 $ 0  
$1.05 - $1.26
            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit - DSIT Option Plan     $ 1.05      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit - DSIT Option Plan     $ 1.26      
Options, Outstanding, Number - DSIT Option Plan     147,770      
Outstanding Options, Weighted Average Remaining Contractual Term - DSIT Option Plan     6 years 7 months 6 days      
Options, Outstanding, Weighted Average Exercise Price - DSIT Option Plan     $ 1.18      
Exerciseable, Number - DSIT Option Plan     0      
Exercisable Options, Weighted Average Exercise Price - DSIT Option Plan     $ 0      
$2.51
            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit - DSIT Option Plan     $ 2.51      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit - DSIT Option Plan     $ 2.51      
Options, Outstanding, Number - DSIT Option Plan     90,994      
Outstanding Options, Weighted Average Remaining Contractual Term - DSIT Option Plan     6 years 7 months 6 days      
Options, Outstanding, Weighted Average Exercise Price - DSIT Option Plan     $ 2.51      
Exerciseable, Number - DSIT Option Plan     0      
Exercisable Options, Weighted Average Exercise Price - DSIT Option Plan     $ 0