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Organization and 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								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Net loss									$ (5,172,436)	$ (7,759,472)	$ (6,316,021)
Cumulative dividends on Series G Preferred Stock									0	0	0
Numerator, basic and diluted net loss available to stockholders									$ (5,172,436)	$ (7,759,472)	$ (6,316,021)
Shares used in computation - basic:
Weighted average common shares outstanding									8,583,795	8,209,539	7,564,082
Shares used in computation - diluted:
Weighted average common shares outstanding									8,583,795	8,209,539	7,564,082
Net loss per share - basic and diluted	$ (0.16)	$ (0.15)	$ (0.08)	$ (0.21)	$ (0.17)	$ (0.27)	$ (0.23)	$ (0.28)	$ (0.60)	$ (0.95)	$ (0.84)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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