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

Common Stock and Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Detail) - shares	Sep. 30, 2024	Dec. 31, 2023
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	7,987,309	7,165,846
Common stock options outstanding and unvested RSUs
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	3,173,341	2,619,944
Shares available for issuance under the 2021 plan
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	2,772,332	2,702,849
Common stock warrants outstanding
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	852,500	852,500
Shares available for issuance as Earnout RSUs
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	140,000	140,000
Employee stock purchase plan
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	1,049,136	850,553