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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 28, 2017
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Gross Initial Carrying Value   $ 11,800 $ 11,800
Cumulative Foreign Currency Translation Adjustment   766 713
Accumulated Amortization   (1,097) (798)
Net Carrying Value   $ 11,469 $ 11,715
Customer relationships - institutional      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years)   14 years 14 years
Gross Initial Carrying Value   $ 3,200 $ 3,200
Cumulative Foreign Currency Translation Adjustment   214 197
Accumulated Amortization   (215) (156)
Net Carrying Value   $ 3,199 $ 3,241
Customer relationships - non-institutional      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years)   10 years 10 years
Gross Initial Carrying Value   $ 4,400 $ 4,400
Cumulative Foreign Currency Translation Adjustment   285 266
Accumulated Amortization   (417) (304)
Net Carrying Value   $ 4,268 $ 4,362
Trademarks and trade names      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years)   10 years 10 years
Gross Initial Carrying Value   $ 1,500 $ 1,500
Cumulative Foreign Currency Translation Adjustment   97 90
Accumulated Amortization   (142) (103)
Net Carrying Value   $ 1,455 $ 1,487
Developed technology      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years)   8 years 8 years
Gross Initial Carrying Value   $ 2,700 $ 2,700
Cumulative Foreign Currency Translation Adjustment   170 160
Accumulated Amortization   (323) (235)
Net Carrying Value   $ 2,547 $ 2,625
Nesscap      
Finite-Lived Intangible Assets [Line Items]      
Gross Initial Carrying Value $ 11,800    
Nesscap | Customer relationships - institutional      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years) 14 years    
Gross Initial Carrying Value $ 3,200    
Nesscap | Customer relationships - non-institutional      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years) 10 years    
Gross Initial Carrying Value $ 4,400    
Nesscap | Trademarks and trade names      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years) 10 years    
Gross Initial Carrying Value $ 1,500    
Nesscap | Developed technology      
Finite-Lived Intangible Assets [Line Items]      
Useful Life (in years) 8 years    
Gross Initial Carrying Value $ 2,700