Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
 1 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Fair value of available-for-sale investments including interest receivable $ 81,800,000    
Purchase of short-term investments not previously reported $ 81,800,000 $ 103,865,243  
Stock Options      
Anti-dilutive securities excluded from computation of net loss per share   2,931,360 2,931,360
Restricted stock      
Anti-dilutive securities excluded from computation of net loss per share   2,022,731 2,022,731
Minimum      
Age of doubtful accounts   30 days  
Maximum      
Age of doubtful accounts   60 days