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Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Gross Carrying Amount, Beginning balance $ 1,867,000 $ 1,867,000
Impairments (1,867,000) 0
Gross Carrying Amount, Ending balance 1,867,000 1,867,000
Accumulated Impairment (1,867,000)  
Net Carrying Amount, Beginning balance $ 1,867,000 1,867,000
Net Carrying Amount, Ending balance   $ 1,867,000