Quarterly report pursuant to Section 13 or 15(d)

Cost-Method Investment (Schedule of Cost Method Investments) (Detail)

v3.10.0.1
Cost-Method Investment (Schedule of Cost Method Investments) (Detail) - USD ($)
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Cost Method Investments, Original Cost $ 250,000 $ 250,000 $ 0
Private Corporation [Member]      
Cost Method Investments, Original Cost $ 250,000   $ 0