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Redeemable Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 29, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jan. 31, 2017
Oct. 03, 2016
Related Party Transaction [Line Items]            
Proceeds from investment     $ 1,000      
Redeemable financial instrument   $ 16,732   $ 16,732 $ 1,000  
DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Redeemable financial instrument $ 10,000 10,000   10,000    
Due to investors, annual return on investment 3.20%          
Due to investors, additional return on investment 15.00%          
Investment agreement, upon termination, period in which payment to investors must occur 30 days          
Due to investors, upon termination of investment agreement, return on investment amount 15.00%          
JKD Capital Partners I, LTD [Member]            
Related Party Transaction [Line Items]            
Redeemable financial instrument   $ 6,732   $ 6,732 $ 1,000 $ 6,000
Due to investors, annual return on investment           50.00%
DGC Family Fintech Trust/CBF And JKD Capital Partners I, LTD [Member]            
Related Party Transaction [Line Items]            
Investment agreement, written notice period for termination 90 days          
Investment agreement, after termination deadline, notice period for additional payment equal to Investment Balance plus an amount equal to any accrued by unpaid investment return 60 days          
JVB's [Member]            
Related Party Transaction [Line Items]            
Potential percent of consideration owed to investor on qualified sale   25.00%        
Investment Agreement, Before Third Anniversary, Greater Than $5,333 But Less Than Or Equal To $8,000 [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Investment agreement, due to investors $ 800          
Investment Agreement, Before Third Anniversary, Greater Than $8,000 [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Due to investors, annual return on investment 10.00%          
Investment Agreement, Following Third Anniversary, Revenue Of Business Greater Than Zero, The Greater Of 20% Investment Amount, Or 20% Of Revenue Of Business Or Any Annual Period Which Revenue Of Business Is Zero Or Less Than Zero [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Due to investors, annual return on investment 3.20%          
Investment terms, range on investment amount for annual return on investment 20.00%          
Investment terms, range on revenue of business for annual return on investment 20.00%          
Maximum [Member] | JKD Capital Partners I, LTD [Member]            
Related Party Transaction [Line Items]            
Redeemable financial instrument           $ 12,000
Maximum [Member] | Investment Agreement, Before Third Anniversary, Greater Than Zero But Less Than Or Equal To $5,333 [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Investment terms, annual period revenue range for additional return on investment $ 5,333          
Maximum [Member] | Investment Agreement, Before Third Anniversary, Greater Than $5,333 But Less Than Or Equal To $8,000 [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Investment terms, annual period revenue range for additional return on investment 8,000          
Minimum [Member] | Investment Agreement, Before Third Anniversary, Greater Than $5,333 But Less Than Or Equal To $8,000 [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Investment terms, annual period revenue range for additional return on investment 5,333          
Minimum [Member] | Investment Agreement, Before Third Anniversary, Greater Than $8,000 [Member] | DGC Family Fintech Trust/CBF [Member]            
Related Party Transaction [Line Items]            
Investment terms, annual period revenue range for additional return on investment $ 8,000