Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Investments (Details)

v3.19.2
Summary of Significant Accounting Policies - Summary of Investments (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Short-term investments: Available- for-sale investments $ 3,032,386 $ 2,878,664