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Line of Credit (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 09, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Nov. 10, 2015
Sep. 03, 2015
Line of Credit Facility [Line Items]                
Line of credit, current   $ 42,987,000   $ 42,987,000   $ 50,000,000    
Interest expense on borrowings   $ 300,000 $ 17,000 $ 600,000 $ 17,000      
Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity $ 55,000,000           $ 85,000,000.0 $ 65,000,000.0
Line of Credit [Member] | US Bank [Member]                
Line of Credit Facility [Line Items]                
Effective interest rate   1.71%   1.71%        
Commitment fees       $ 0        
Line of Credit [Member] | US Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.25%              
Line of Credit [Member] | US Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.75%              
Line of Credit [Member] | US Bank [Member] | Base Rate [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 0.00%              
Line of Credit [Member] | US Bank [Member] | Base Rate [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 0.50%              
Line of Credit [Member] | US Bank [Member] | Enson [Member]                
Line of Credit Facility [Line Items]                
Subsidiary ownership percentage securing facility 65.00%              
Letter of Credit [Member]                
Line of Credit Facility [Line Items]                
Letter of credit outstanding amount   $ 13,000   $ 13,000