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Fair Value of Financial Instruments (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value Transfers Between Levels [Abstract]    
Transfers from Level 1 to Level 2 $ 0 $ 0
Transfers from Level 2 to Level 1 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair Value of Financial Instruments [Abstract]    
Cash and cash equivalents 45,978,737 88,067,647
Quoted Prices in Active Markets (Level 1) [Member]    
Fair Value of Financial Instruments [Abstract]    
Cash and cash equivalents 45,978,737 88,067,647
Quoted Prices in Inactive Markets (Level 2) [Member]    
Fair Value of Financial Instruments [Abstract]    
Cash and cash equivalents 0 0
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value of Financial Instruments [Abstract]    
Cash and cash equivalents $ 0 $ 0