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Investments (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Short-term investments
Dec. 31, 2012
Warrant to purchase common stock
Dec. 31, 2012
Warrant to purchase common stock
Maximum
Sep. 30, 2012
Available for sale common stock
Dec. 31, 2012
Available for sale common stock
Investments              
Cost   $ 331,000 $ 331,000 $ 124,000     $ 207,000
Estimated Fair Value   242,000 242,000       242,000
Carrying Value   242,000 242,000   1,000   242,000
Shares received from transaction           3.0  
Net proceeds from sale of shares $ 200,000