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Income Taxes - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2018 USD ($)
Income Taxes [Line Items] |
Net deferred tax asset | $ 0
Income tax expense | 0
Valuation allowance, net operating loss | $ 1,700,000
Estimated annual effective tax rate | 25.00%
Effective tax rate | 0.00%
U.S. federal tax rate | 21.00%
Federal [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards | $ 1,700,000
Net operating loss carryforwards subject to expiration | $ 163,300,000
Net operating loss carryforwards expiration year | 2025
Net operating loss carryforwards expiration year | 2037
Foreign [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards | $ 5,700,000
Net operating loss carryforwards subject to expiration | $ 37,500,000

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