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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Net deferred tax asset	$ 0	$ 0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 175,000,000
Net operating loss carryforwards expiration year	2025
Net operating loss carryforwards expiration year	2035
Net operating loss carryforwards, indefinitely	$ 15,500,000	$ 15,500,000
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	49,000,000
2025 Through 2027 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	43,000,000
2028 Through 2037 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 116,000,000

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- Definition

Income taxes.

+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

+ References

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

+ References

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