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Lease Obligations (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
May. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]        
Lease expiration year, Minimum   2016    
Lease expiration year, Maximum   2019    
Percentage of increase in annual base rent, Minimum   3.00%    
Percentage of increase in annual base rent, Maximum   3.50%    
Lease exit costs   $ 1,020 $ 1,084 $ 560
Rent expense, net sublease income   3,300 3,500  
Adjustment for accretion and changes in lease assumptions   900 1,100 600
Rent expense   400 700 $ 700
Deferred rent   190 327  
Contract Termination        
Operating Leased Assets [Line Items]        
Lease exit costs   $ 900 $ 3,300  
Scenario, Forecast | Corporate Headquarters - San Diego, CA        
Operating Leased Assets [Line Items]        
Initial lease term 7 years      
Rent expense $ 100      
Annual increase to rent over initial lease term (percent) 3.00%      
Renewal period of lease 5 years