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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
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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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