Markforged Holding Corporation Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail) $ in Millions						3 Months Ended		9 Months Ended		12 Months Ended
Leases - Additional Information (Detail) $ in Millions	Apr. 01, 2022 USD ($)	Nov. 30, 2020 ft²	Jul. 31, 2019	Aug. 31, 2017	Jun. 30, 2017	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 ft²	Mar. 31, 2019 ft²	Jan. 31, 2017 ft²
Lessee, Lease, Description [Line Items]
Operating lease, rent expense								$ 0.4
Annual rent increase percentage								3.00%
Rent expense under the operating lease agreements						$ 2.5	$ 0.6	$ 5.1	$ 1.9
Watertown, Massachusetts [Member]
Lessee, Lease, Description [Line Items]
Rentable area \| ft²		36,291										32,000
Operating lease, expiration date		Jul. 31, 2028		Jan. 31, 2024	Aug. 01, 2023
Operating leases option to extend description		option to extend for 2 additional periods of 5 years
Billerica, Massachusetts [Member]
Lessee, Lease, Description [Line Items]
Rentable area \| ft²										21,902	25,000
Operating lease, expiration date			Jul. 01, 2026
Lease maturity date										May 31, 2029
Operating leases option to extend description			option to extend for 2 additional periods of 5 years each
Undiscounted future minimum rent obligation						2.7		2.7
Waltham, Massachusetts [Member]
Lessee, Lease, Description [Line Items]
Rentable area \| ft²										120,681
Operating lease, expiration date	Sep. 30, 2031
Operating lease, rent expense								4.8
Security deposit						0.8		0.8
Undiscounted future minimum rent obligation						$ 49.3		$ 49.3
Discounted right of use asset and liability	$ 36.2