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Stockholders' Equity - Summary of Stock-Based Compensation Expenses (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Amortization of outstanding | $ 92,940 |  | $ 726,455 |
Stock-based compensation | 878,000 | $ 227,000 | 1,512,000 | $ 1,065,000
Anelixis [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Amortization of equity-based awards | 38,000 |  | 38,000 |
Directors and Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Modifications of terms related to grants | 471,000 |  | 471,000 |
New grants of preferred equity-based awards | 276,000 |  | 276,000 |
Equity-Based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Amortization of outstanding | $ 93,000 | $ 227,000 | $ 727,000 | $ 1,065,000

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