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Nature of Business and Summary of Significant Accounting Policies Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable $ 3,431 $ 7,605
Fair value, measurements, recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liability 2,798  
ESW Holdings, Inc.    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 3,400