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Commitments (Details Textual) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Pennsylvania Office [Member]
sqft
Apr. 30, 2013
San Diego Office [Member]
sqft
Dec. 31, 2013
San Diego Office [Member]
Apr. 30, 2013
Minimum [Member]
San Diego Office [Member]
Apr. 30, 2013
Maximum [Member]
San Diego Office [Member]
Operating Leased Assets [Line Items]                
Area of leased office space       8,761        
Lease renewal option, term       3 years        
Area of additional leased office space         26,500      
Initial lease term         10 years      
Monthly payments under the lease             $ 0 $ 82,945
Security deposit         64,000      
Leasehold improvements           2,300,000    
Rent expense, net $ 906,000 $ 444,000 $ 430,000