Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.8.0.1
Significant Accounting Policies - Additional Information (Detail) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Uninsured portion of cash balance $ 4,507,863 $ 5,916,143