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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Net deferred tax asset	$ 0
Federal income tax rate	34.00%	34.00%
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 154,327,996
Net operating loss carryforwards expiration year	2025
Net operating loss carryforwards expiration year	2035
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 25,217,427
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	$ 112,000,000

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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
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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

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