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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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