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Organization and Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable $ 504,510 $ 318,744
Billed receivable    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable 360,512 193,065
Unbilled receivable    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable $ 143,998 $ 125,679