Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details)

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Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 36,830,924 $ 12,446,838 $ 8,903,000 $ 7,307,000
Restricted cash included in current/long term assets 586,000 561,000 636,000 691,000
Cash, cash equivalents and restricted cash in the statement of cash flows $ 37,417,000 $ 13,007,838 $ 9,539,000 $ 7,998,000