XML 95 R80.htm IDEA: XBRL DOCUMENT v3.19.1
Lease Commitment and Total Rental Expense - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rental expenses $ 76,096 $ 107,418 $ 118,805