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Income Taxes - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2019 USD ($)
Income Taxes [Line Items] |
Net deferred tax asset | $ 0
Income tax expense | 0
Valuation allowance, net operating loss | $ 1,100,000
Estimated Annual Effective Tax Rate | 67.745%
Effective tax rate | 0.00%
Federal [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards subject to expiration | $ 167,600,000
Net operating loss carryforwards expiration year | 2025
Net operating loss carryforwards expiration year | 2037
Net operating loss carryforwards | $ 200,000
Foreign [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards subject to expiration | 41,900,000
Net operating loss carryforwards | $ 1,000,000

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