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Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($)
Income Taxes [Line Items]
Net deferred tax asset	$ 0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 161,506,084
Net operating loss carryforwards expiration year	2025
Net operating loss carryforwards expiration year	2037
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 31,766,091
2025 Through 2027 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	43,000,000
2028 Through 2036 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 119,000,000

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- Definition

Income taxes.

+ References

No definition available.

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- Definition

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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://www.xbrl.org/2003/role/presentationRef
-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 subject to expiration dates.

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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