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Commitments and Contingencies (Details Textual)
ft² in Thousands
1 Months Ended 3 Months Ended
Jun. 30, 2017
USD ($)
ft²
Oct. 31, 2016
USD ($)
ft²
Jun. 30, 2015
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
Loss Contingencies [Line Items]          
Tenant improvements $ 933,000        
San Diego, California [Member]          
Loss Contingencies [Line Items]          
Tenant improvements $ 2,200,000        
Area leased (in square feet) | ft²   51      
Initial lease term   10 years      
Adjustable rent period   2 years      
Security deposit   $ 95,000      
Plymouth Meeting, Pennsylvania [Member]          
Loss Contingencies [Line Items]          
Increase to monthly payment         $ 16,000
Area leased (in square feet) | ft² 30        
Initial lease term       11 years 6 months  
Security deposit $ 75,000     $ 49,000  
Minimum [Member] | San Diego Office [Member]          
Loss Contingencies [Line Items]          
Increase to monthly payment     $ 13,000    
Tenant improvements 822,000        
Minimum [Member] | San Diego, California [Member]          
Loss Contingencies [Line Items]          
Monthly payments under the lease   0      
Minimum [Member] | Plymouth Meeting, Pennsylvania [Member]          
Loss Contingencies [Line Items]          
Monthly payments under the lease 75,000     0  
Maximum [Member] | San Diego, California [Member]          
Loss Contingencies [Line Items]          
Monthly payments under the lease   $ 95,000      
Maximum [Member] | Plymouth Meeting, Pennsylvania [Member]          
Loss Contingencies [Line Items]          
Monthly payments under the lease $ 90,000     $ 58,000