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Summary of Significant Accounting Policies (Detail Textuals) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Leases [Line Items]        
Lease liability $ 1,233,000      
Cash and cash equivalents 15,159,000 $ 17,504,000 $ 19,824,000 $ 23,910,000
Deferred rent obligation 120,000      
New guidance adoption        
Leases [Line Items]        
Lease liability $ 1,500,000