Leases - Additional Information (Detail)		12 Months Ended
	Jul. 01, 2019 USD ($) ft²	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Regulatory Assets [Line Items]
Lease renewal term	3 years	2 years
Lessee, operating lease, existence of option to extend		true
Description of operating lease extension period		In May 2019, the Company amended its existing lease of the Company’s corporate headquarters to extend the lease term for an additional two years. The lease extension period commenced on November 1, 2019 and expires on October 31, 2021.
Leased area | ft²	75,000
Lease term	12 years 6 months
Operating lease costs		$ 2,174,000	$ 1,391,000
Cash paid for operating lease liabilities		1,884,000	1,401,000
Non-cash operating lease ROU assets obtained in exchange for operating lease obligations		$ 778,000	$ 6,511,000
Weighted average discount rate		8.60%	8.30%
Weighted average remaining lease term		8 years 3 months 18 days	8 years 4 months 24 days
Maximum [Member]
Regulatory Assets [Line Items]
Operating lease, allowance	$ 1,200,000