Quarterly report pursuant to Section 13 or 15(d)

Investment in a Joint Venture (Details Textual)

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Investment in a Joint Venture (Details Textual) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2010
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Investment [Line Items]          
Stock Issued During Period, Value, New Issues $ 195,000        
Payments To Fund Joint Venture Investments   500,000      
Maximum Amount Committed Towards Contributions In Joint Venture   2,000,000      
Cash and cash equivalents 4,058,000   572,000 4,610,000 5,541,000
Ownership Percentage In Joint Venture 50.00%        
PSI Parent [Member]
          
Investment [Line Items]          
Stock Issued During Period, Shares, New Issues   1,440,000      
Stock Issued During Period, Value, New Issues   2,600,000      
Payments to Acquire Interest in Joint Venture   1,000,000      
Corporate Joint Venture [Member]
          
Investment [Line Items]          
Cash and cash equivalents 381,000        
Acquisition of product license   $ 3,600,000      
Finite-Lived Intangible Assets, Useful Life (in years)   13 years 9 months