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Subsequent Event - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended
	Nov. 08, 2021 USD ($) ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Subsequent Event [Line Items]
Operating lease costs		$ 323	$ 350	$ 1,008	$ 1,053
Subsequent Event | 1 Casper, LLC
Subsequent Event [Line Items]
Sale price	$ 102,300
Area of manufacturing facility | ft²	263,900
Lease initial term	20 years
Lease renewal option	4 years
Lease renewal options	renewal options of five years
Lessee,option to extend [true false]	true
Operating lease costs	$ 9,500
Lease, description	The total annual rent under the Lease starts at approximately $9.5 million per year, subject to a 50% rent abatement during the first year of the Lease, and will increase annually by (i) 2.5% in the second through fifth year of the Lease and (ii) 3% in the sixth and each subsequent year of the Lease, including any renewal term.
Security deposit	$ 2,000
Lease repurchase description	the Company has four options to repurchase the Property, in 2026, 2031, 2036 and 2041, for the greater of (i) $102.3 million and (ii) the fair market value of the Property
Subsequent Event | 1 Casper, LLC | Minimum
Subsequent Event [Line Items]
Lease repurchase, amount	$ 102,300

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