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15. Acquisition (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Nov. 01, 2017
Assets:    
Cash and cash equivalents   $ 354
Restricted cash   78
Trading securities   6
Fixed assets   88
Brokerage and other receivables   235
Other assets   4
Total assets   765
Liabilities:    
Customer liabilities   174
Trade payables   1
Other liabilities   1
Total liabilities   176
Net assets acquired   589
Goodwill $ 1,856 896
Total purchase price   $ 1,485