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