Restructuring and Severance - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended		15 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses	$ 274,000	$ 1,417,000		$ 662,000	$ 1,482,000
Impairment of right-of-use operating lease assets				281,000	1,199,000
Sublease income received						$ 0
3VR
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses	274,000			662,000
3VR | Facility Rental
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses	127,000			456,000
Impairment of right-of-use operating lease assets	281,000
3VR | Severance
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses	$ 147,000			$ 206,000
Prior Acquisition
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses		1,417,000			1,482,000
Sublease income received		0	$ 198,000
Prior Acquisition | Facility Rental
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses		1,397,000			1,398,000
Impairment of right-of-use operating lease assets		1,199,000
Prior Acquisition | Severance
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses		$ 20,000			$ 84,000