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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Net income (loss)	$ (641,557)	$ (1,916,885)	$ (2,386,318)	$ (4,116,148)
Numerator, basic and diluted net income (loss) available to stockholders	$ (641,557)	$ (1,916,885)	$ (2,386,318)	$ (4,116,148)
Shares used in computation - basic:
Weighted average common shares outstanding	8,466,909	8,322,512	8,466,909	8,022,108
Common shares outstanding for basic	8,466,909	8,322,512	8,466,909	8,022,108
Shares used in computation - diluted:
Common shares outstanding for basic	8,466,909	8,322,512	8,466,909	8,022,108
Shares used in computing diluted net income per share	8,466,909	8,322,512	8,466,909	8,022,108
Net (loss) per share - basic	$ (0.08)	$ (0.23)	$ (0.28)	$ (0.51)
Net (loss) per share - diluted	$ (0.08)	$ (0.23)	$ (0.28)	$ (0.51)

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