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Property and Equipment - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Depreciation expense	$ 436,247	$ 495,347	$ 458,734
Tenant Improvement | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	6 years
Tenant Improvement | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	10 years
Property and Equipment, Other Types
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	3 years
Property and Equipment, Other Types | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	3 years
Property and Equipment, Other Types | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life	5 years

X

- 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
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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