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

Convertible Preferred Stock, Common Stock and Stockholders' Equity (Deficit) - Summary of Common Stock Reserved for Future Issuance (Detail) - shares	Sep. 30, 2022	Dec. 31, 2021
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	64,931,868	56,394,803
Common stock options outstanding and unvested RSU [Member]
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	24,700,014	20,267,035
Shares available for issuance under the 2021 plan [Member]
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	23,746,924	21,502,768
Common stock warrants outstanding [Member]
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 [Member]
Schedule for Common Stock Reserved for Future Issuance [Line Items]
Total shares of authorized common stock reserved for future issuance	6,559,930	4,700,000