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Restructuring Activities - Summary of Charges Related to Restructuring Activities (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]
Accrued Restructuring Expenses				$ 66,000
Expenses	$ 0	$ 0	$ 0	0
Less: Payments				(51,000)
Accrued Restructuring Expenses		15,000		15,000
Severance, Benefits and Related Costs Due to Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Accrued Restructuring Expenses				66,000
Less: Payments				(51,000)
Accrued Restructuring Expenses		$ 15,000		$ 15,000