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3. Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ 0 $ 0
Accounts receivable, net 1,075 881
U.S. and State Government [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 191 103
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 884 $ 778