Restructuring Activities - Summary of Charges Related to Restructuring Activities (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost And Reserve [Line Items]
Accrued Restructuring Expenses		$ 66,000
Expenses	$ 0	0
Less: Payments		(20,000)
Accrued Restructuring Expenses		46,000
Severance, Benefits and Related Costs Due to Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Accrued Restructuring Expenses		66,000
Less: Payments		(20,000)
Accrued Restructuring Expenses		$ 46,000