Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended		12 Months Ended
		Jul. 17, 2024 USD ($) $ / shares	Mar. 22, 2024 USD ($)	Mar. 21, 2024 USD ($) shares $ / shares	Jul. 31, 2024 shares	Feb. 29, 2024 USD ($) shares	Dec. 31, 2024 USD ($) vote $ / shares shares		Mar. 20, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares		Dec. 31, 2022 shares	[2]	Dec. 31, 2020 $ / shares shares	Oct. 31, 2020 $ / shares
Temporary Equity [Line Items]
Temporary equity, shares authorized (in shares)									53,761,506	53,761,506
Temporary equity, par value (in dollars per share) | $ / shares									$ 0.001	$ 0.001
Common stock, issued (in shares)	[1]						27,531,490			2,004,783
Common stock, outstanding (in shares)	[1]						27,518,439			1,969,360
Issuance of common stock to Graphite stockholders as a result of the Merger (in shares)				8,320,485
Sale of stock, number of shares issued (in shares)				15,409,102	1,578,947
Sale of stock, consideration received | $		$ 30,000		$ 53,500
Common stock, par value (in dollars per share) | $ / shares		$ 0.00001					$ 0.00001	[1]		$ 0.00001	[1]
Sale of stock, price per share (in dollars per share) | $ / shares		$ 19.00
Vote per share of common stock | vote							1
Series A preferred stock warrants converted (in shares)				164,676
Reclassification of warrant liability to equity | $			$ 1,900				$ 1,918
LENZ OpCo Preferred Stock Exchanged for Graphite Common Stock
Temporary Equity [Line Items]
Shares issued, conversion of convertible preferred stock (in shares)				10,705,829
Class B Convertible Common Stock Exchanged for Graphite Common Stock
Temporary Equity [Line Items]
Shares issued, conversion of convertible preferred stock (in shares)				554,843
PIPE Financing
Temporary Equity [Line Items]
Sale of stock, number of shares issued (in shares)				3,559,565
Sale of stock, consideration received | $				$ 53,500
December 2020 Warrants
Temporary Equity [Line Items]
Warrants exercised, number of shares (in shares)						470,000								470,000
Proceeds from warrant exercises | $						$ 100
Warrants exchanged at closing of Merger (in shares)				95,034
Warrants to purchase common stock
Temporary Equity [Line Items]
Exercise price (in dollars per share) | $ / shares				$ 10.64
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Temporary equity, shares authorized (in shares)							0			22,791,777
Temporary equity, par value (in dollars per share) | $ / shares							$ 0.001			$ 0.001
Temporary equity, shares issued (in shares)							0		21,977,282	21,977,282
Temporary equity, shares outstanding (in shares)							0		21,977,282	21,977,282	[2]	21,977,282
Liquidation preference | $									$ 47,300	$ 47,300
Liquidation preference per share (in dollars per share) | $ / shares									$ 2.15	$ 2.15
Conversion of convertible preferred stock (in shares)							21,977,282
Series A-1 Convertible Preferred Stock
Temporary Equity [Line Items]
Temporary equity, shares authorized (in shares)							0			2,950,548
Temporary equity, par value (in dollars per share) | $ / shares							$ 0.001			$ 0.001
Temporary equity, shares issued (in shares)							0		2,950,548	2,950,548
Temporary equity, shares outstanding (in shares)							0		2,950,548	2,950,548	[2]	2,950,548
Liquidation preference | $									$ 10,000	$ 10,000
Liquidation preference per share (in dollars per share) | $ / shares									$ 3.3892	$ 3.3892
Conversion of convertible preferred stock (in shares)							2,950,548
Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Temporary equity, shares authorized (in shares)							0			28,019,181
Temporary equity, par value (in dollars per share) | $ / shares							$ 0.001			$ 0.001
Temporary equity, shares issued (in shares)							0		28,019,181	28,019,181
Temporary equity, shares outstanding (in shares)							0		28,019,181	28,019,181
Liquidation preference | $									$ 83,500	$ 83,500
Liquidation preference per share (in dollars per share) | $ / shares									$ 2.9801	$ 2.9801
Convertible preferred stock | LENZ OpCo Preferred Stock Exchanged for Graphite Common Stock
Temporary Equity [Line Items]
Conversion of convertible preferred stock (in shares)				52,947,011
Class A Common Stock
Temporary Equity [Line Items]
Common stock, issued (in shares)									11,838,624	9,915,013
Common stock, outstanding (in shares)				11,668,867					11,668,867	9,739,818
Class A Common Stock | December 2020 Warrants
Temporary Equity [Line Items]
Exercise price (in dollars per share) | $ / shares														$ 0.21
Class B convertible common stock
Temporary Equity [Line Items]
Temporary equity, shares issued (in shares)				11,838,624					2,744,184	2,744,184
Temporary equity, shares outstanding (in shares)									2,744,184	2,744,184
Common Stock
Temporary Equity [Line Items]
Common stock, issued (in shares)				2,393,729
Common stock, outstanding (in shares)				2,359,408
Series A Preferred Stock | October 2020 Warrants
Temporary Equity [Line Items]
Exercise price (in dollars per share) | $ / shares															$ 2.15

[1] Retroactively recast for the reverse recapitalization as described in Note 3.

[2] Retroactively recast for the reverse recapitalization as described in Note 3.