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Commitments (Details Textual)
ft² in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
ft²
Jul. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2014
USD ($)
Apr. 30, 2013
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Operating Leased Assets [Line Items]                
Adjustable rent period 2 years              
Tenant Improvements           $ 933,000    
Rent expense, net           1,600,000 $ 1,300,000 $ 1,200,000
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      
Tenant Improvements           822,000    
San Diego, California                
Operating Leased Assets [Line Items]                
Area (square feet) | ft² 51              
Initial lease term 10 years              
Security deposit $ 95,000              
Increase in monthly lease payments     $ 13,000          
Tenant Improvements           $ 390,000    
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 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       $ 95,000 $ 83,000