Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Book value and estimated fair value (Details)

v3.19.2
Summary of Significant Accounting Policies - Book value and estimated fair value (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Contingent consideration $ (520,000) $ (520,000)
Book Value    
Contingent consideration (520,000)  
Estimated Fair Value    
Contingent consideration $ (520,000)