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	Mar. 31, 2024	Dec. 31, 2023
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	82,749,518	71,658,479
Common stock options outstanding and unvested RSU
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	24,474,480	26,199,449
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	37,858,686	27,028,491
Common stock warrants outstanding
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	8,525,000	8,525,000
Shares available for issuance as Earnout RSU [Member]
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	1,400,000	1,400,000
Employee stock purchase plan
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	10,491,352	8,505,539