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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Short-term investment maturity period			3 months
Restricted cash	$ 10,135		$ 10,135		$ 10,135
Weighted average number of common shares outstanding	9,456,300	8,466,909	9,301,796	8,466,909
Redeemable preferred stock outstanding	0		0
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life			3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life			30 years

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
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