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Property and Equipment (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,416,371	$ 2,112,893
Less accumulated depreciation	(1,309,472)	(1,056,561)
Property and equipment, net	1,106,899	1,056,332
Depreciation of property and equipment	263,541	190,540	$ 191,484
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	314,024	262,135
Laboratory Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	1,325,667	1,130,180
Office Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	11,085	6,610
Computer Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	192,430	169,423
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 573,165	36,128
Construction in Progress
Property, Plant and Equipment [Line Items]
Property and equipment		$ 508,417

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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-Name Accounting Standards Codification
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