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Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Net income (loss)	$ (1,309,275)	$ (2,251,097)	$ (3,695,592)	$ (6,367,245)
Numerator, basic and diluted net income (loss) available to stockholders	$ (1,309,275)	$ (2,251,097)	$ (3,695,592)	$ (6,367,245)
Shares used in computation - basic:
Weighted average common shares outstanding	8,466,909	8,388,821	8,466,909	8,145,689
Common shares outstanding for basic	8,466,909	8,388,821	8,466,909	8,145,689
Shares used in computation - diluted:
Common shares outstanding for basic	8,466,909	8,388,821	8,466,909	8,145,689
Shares used in computing diluted net income per share	8,466,909	8,388,821	8,466,909	8,145,689
Net (loss) per share - basic	$ (0.15)	$ (0.27)	$ (0.44)	$ (0.78)
Net (loss) per share - diluted	$ (0.15)	$ (0.27)	$ (0.44)	$ (0.78)

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