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4. Furniture and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Furniture and equipment, gross $ 8,296 $ 7,627
Less: accumulated depreciation and amortization (6,544) (5,610)
Furniture and equipment, net 1,752 2,017
Furniture and Fixtures [Member]    
Furniture and equipment, gross 1,566 1,566
Computer and Telephone Equipment [Member]    
Furniture and equipment, gross 5,470 4,907
Leasehold Improvements [Member]    
Furniture and equipment, gross $ 1,260 $ 1,154