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Commitments (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jul. 31, 2015
Jun. 30, 2015
Mar. 31, 2014
Apr. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]              
Tenant Improvements         $ 933,000    
Lease incentive recorded as fixed assets and deferred rent         773,000 $ 933,000 $ 2,538,000
Rent expense, net         $ 1,300,000 $ 1,200,000 $ 444,000
Plymouth Meeting, Pennsylvania              
Operating Leased Assets [Line Items]              
Initial lease term     11 years 6 months        
Security deposit     $ 49,000        
Increase in monthly lease payments $ 16,000            
San Diego Office              
Operating Leased Assets [Line Items]              
Initial lease term       10 years      
Security deposit       $ 64,000      
San Diego, California              
Operating Leased Assets [Line Items]              
Increase in monthly lease payments   $ 13,000          
Minimum | Plymouth Meeting, Pennsylvania              
Operating Leased Assets [Line Items]              
Monthly payments under the lease     0        
Minimum | San Diego Office              
Operating Leased Assets [Line Items]              
Monthly payments under the lease       0      
Maximum | Plymouth Meeting, Pennsylvania              
Operating Leased Assets [Line Items]              
Monthly payments under the lease     $ 58,000        
Maximum | San Diego Office              
Operating Leased Assets [Line Items]              
Monthly payments under the lease       $ 83,000