Quarterly report pursuant to Section 13 or 15(d)

Notes Receivable (Details)

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Notes Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 7,143 $ 3,617
Loans to employees, net of reserves of $924, due December 2018 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 4
Fair value of convertible loan receivable from Spectrum Global Solutions, Inc., matured April 2018 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 3,998 3,613
Fair value of convertible loan receivable from Spectrum Global Solutions, Inc., due March 2019 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,240
Fair value of convertible loan receivable from Spectrum Global Solutions, Inc., due August 2019 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 905