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Commitments (Details Textual) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Pennsylvania Office [Member]
sqft
Feb. 29, 2012
Pennsylvania Office [Member]
sqft
Jan. 31, 2012
Pennsylvania Office [Member]
sqft
Dec. 31, 2012
San Diego Office [Member]
sqft
Operating Leased Assets [Line Items]              
Area of leased office space       8,761   6,442 13,000
Area of additional leased office space         2,319    
Annual rent for first year $ 376,000     $ 122,000     $ 221,000
Annual rent for second year 191,000     126,000     255,000
Annual rent for third year 188,000     175,000     184,000
Annual rent for the fourth year 187,000     180,000      
Annual rent for the fifth year 92,000     184,000      
Annual rent for the sixth year       188,000      
Annual rent for the seventh year       193,000      
Lease renewal option, term       3 years     5 years
Rent expense, net 444,000 430,000 607,000        
Sublease income $ 0 $ 0 $ 269,000