Warrants (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2020 $ / shares shares	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Feb. 10, 2023 USD ($) year $ / shares shares	Mar. 11, 2021 USD ($) shares	Mar. 11, 2020 $ / shares
Common Stock
Class of Warrant or Right [Line Items]
Proceeds from at-the-market offering, net of commissions and fees and issuance costs (in shares)		4,671,406	6,045,428
At Market Issuance Sales Agreement 2025
Class of Warrant or Right [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		4,671,406
CLA
Class of Warrant or Right [Line Items]
Number of ordinary shares called by each warrant (in shares)					9,999,996
CLA | Conversion of CLA Units To Ouster Common Stock
Class of Warrant or Right [Line Items]
Number of ordinary shares called by each warrant (in shares)	1
Warrant, conversion ratio					1
CLA | Conversion Of CLA Units To Public Warrant
Class of Warrant or Right [Line Items]
Number of ordinary shares called by each warrant (in shares)	0.5
Public Warrants
Class of Warrant or Right [Line Items]
Warrant liabilities | $					$ 17.9
Redeem of warrants, price (in dollars per share) | $ / shares	$ 0.10
Exercise of warrant, threshold common stock price (in dollars per share) | $ / shares	$ 180.00
Class of warrant or right, exercisable, threshold trading days	20 days
Class of warrant or right, exercisable, threshold trading-day period	30 days
Public Warrants | Conversion of Warrant to Ouster Common Stock
Class of Warrant or Right [Line Items]
Number of ordinary shares called by each warrant (in shares)					0.1
Public Warrants | CLA
Class of Warrant or Right [Line Items]
Warrant, exercisable, threshold period (in dollars per share)	12 months
Warrant, expiration period (in dollars per share)	5 years
Warrants issued, exercise price (in dollars per share) | $ / shares						$ 115.00
Amazon Warrant | Velodyne Lidar, Inc. | Expected Term | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs | year				6.98
Amazon Warrant | Velodyne Lidar, Inc. | Price Volatility | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs				0.537
Amazon Warrant | Velodyne Lidar, Inc. | Risk Free Interest Rate | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs				0.0386
Amazon Warrant | Velodyne Lidar, Inc. | Expected dividend yield | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs				0
Amazoncom NV Investment Holdings LLLC | Amazon Warrant | Velodyne Lidar, Inc.
Class of Warrant or Right [Line Items]
Warrants issued, exercise price (in dollars per share) | $ / shares		$ 50.57	$ 50.64	$ 50.71
Warrants issued, number of preferred stock callable (in shares)		3,271,970		3,263,898
Number of shares issuable (in shares)		4,077	3,374
Class of warrant or right, vesting payments to be received | $				$ 100.0
Warrants vested during period (in shares)		568,680	226,691
Warrant vested, noncash reduction to revenue | $		$ 2.6	$ 0.9
Number of warrants vested (in shares)		2,728,985