Leases - Additional Information (Detail) ft² in Thousands		4 Months Ended	12 Months Ended
	Jul. 01, 2019 USD ($) ft² renewal_option	Mar. 01, 2022 extension	Dec. 31, 2021 USD ($) renewal_option	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 01, 2021
Regulatory Assets [Line Items]
Lease renewal term	3 years					2 months
Leased area | ft²	75
Lease term	12 years 6 months
Number of renewal options | renewal_option	1
Operating lease, allowance (up to)	$ 1,200,000
Operating lease costs			$ 2,176,000	$ 2,174,000	$ 1,391,000
Cash paid for operating lease liabilities			2,005,000	1,884,000	1,401,000
Non-cash operating lease ROU assets obtained in exchange for operating lease obligations			$ 850,000	$ 778,000	$ 6,511,000
Weighted average discount rate			8.90%	8.60%	8.30%
Weighted average remaining lease term			8 years 3 months 18 days	8 years 3 months 18 days	8 years 4 months 24 days
Subsequent Event
Regulatory Assets [Line Items]
Number of extensions | extension		3
Suburbs of Minneapolis
Regulatory Assets [Line Items]
Leased facilities | renewal_option			2