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Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($) | 12 Months Ended
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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

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