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EQUITY DSIT Option Plan by Exercise Price Range (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2012
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
$1.05 - $1.26
Dec. 31, 2013
$2.70
Sep. 30, 2013
DSIT - Legal Entity [Member]
Dec. 31, 2013
DSIT - Legal Entity [Member]
Equity [Abstract]                    
Acorn percentage holdings in DSIT     88.30%              
Fully diluted ownership 85.10%               77.40% 77.40%
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%             88.30%  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit - DSIT Option Plan             $ 1.05 $ 2.70    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit - DSIT Option Plan             $ 1.26 $ 2.70    
Options, Outstanding, Number - DSIT Option Plan     243,924 238,764 240,824 152,400 147,770 96,154    
Outstanding Options, Weighted Average Remaining Contractual Term - DSIT Option Plan             4 years 7 months 6 days 4 years 7 months 6 days    
Options, Outstanding, Weighted Average Exercise Price - DSIT Option Plan     $ 1.78 $ 1.69 $ 1.67 $ 1.18 $ 1.18 $ 2.70    
Exerciseable, Number - DSIT Option Plan     101,904 0 0   81,068 20,836    
Exercisable Options, Weighted Average Exercise Price - DSIT Option Plan     $ 1.51 $ 0 $ 0   $ 1.20 $ 2.70