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Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Accrued Expenses [Line Items]    
Accrued professional fees $ 246 $ 35
Accrued compensation costs 189 129
Accrued sales taxes and regulatory fees 168 259
Other accrued expenses 131 80
Accrued communication costs 49 78
Deferred revenue 43 393
Deferred rent expense 13 46
Super G Warrant liability 0 165
Accrued interest expense 0 18
Accrued expenses and other liabilities 910 1,262
Series A-2 Preferred Stock    
Schedule Of Accrued Expenses [Line Items]    
Accrued dividends on Series A-2 Preferred Stock $ 71 $ 59