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Significant Accounting Policies - Recently Issued Accounting Standards (Detail) - USD ($)	Dec. 31, 2017	Jan. 31, 2017	Dec. 31, 2016
New accounting pronouncement, modified retrospective method
Deferred tax assets, valuation allowance	$ 56,354,793		$ 54,667,237
ASU 2016-09
New accounting pronouncement, modified retrospective method
Deferred tax assets for equity compensation		$ 98,767

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 25
-Paragraph 20
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-Name Accounting Standards Codification
-Topic 740
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-Section 50
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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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