Warrants - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended	29 Months Ended
	Feb. 10, 2023 USD ($) year day $ / shares shares	Aug. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2024 year shares	Sep. 30, 2024 year shares	Sep. 30, 2024 year shares	Dec. 31, 2023 year	Sep. 30, 2023 year	Mar. 11, 2021 USD ($) $ / shares shares
At the Market Program
Class of Warrant or Right [Line Items]
Sale of stock, number of shares issued in transaction (in shares)			1,649,310	3,482,181	7,144,427
CLA
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)								999,999
Conversion of CLA Units to Ouster Common Stock | CLA
Class of Warrant or Right [Line Items]
Number of ordinary shares called by each warrant (in shares)		1
Warrant, conversion ratio								1
Conversion of CLA Units to Public Warrant | CLA
Class of Warrant or Right [Line Items]
Number of ordinary shares called by each warrant (in shares)		0.5
Private Placement Warrants | Expected term (years) | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs | year			1.4	1.4	1.4	2.2	2.4
Private Placement Warrants | Expected volatility | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs			0.9700	0.9700	0.9700	0.9400	0.9300
Private Placement Warrants | Risk-free interest rate | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs			0.0384	0.0384	0.0384	0.0419	0.0493
Public Warrants
Class of Warrant or Right [Line Items]
Redeem of warrants, price (in dollars per share) | $ / shares		$ 0.10
Warrant liabilities | $								$ 17.9
Exercise of warrant, threshold common stock price (in dollars per share) | $ / shares		$ 180.00
Exercise of warrant, threshold trading days		20 days
Exercise of warrant, threshold trading-day period		30 days
Public Warrants | Velodyne
Class of Warrant or Right [Line Items]
Redeem of warrants, price (in dollars per share) | $ / shares	$ 0.10
Warrants issued, exercise price (in dollars per share) | $ / shares	$ 140.20
Number of ordinary shares called by each warrant (in shares)	0.06153
Exercise of warrant, threshold common stock price (in dollars per share) | $ / shares	$ 219.41
Exercise of warrant, threshold trading days	20 days
Exercise of warrant, threshold trading-day period	30 days
Number of warrants acquired in business combination (in shares)	5,973,170
Business days prior to date redemption notice sent to warrant holders | day	3
Public Warrants | CLA
Class of Warrant or Right [Line Items]
Warrant, exercisable, threshold period		12 months
Warrant, expiration period		5 years
Warrants issued, exercise price (in dollars per share) | $ / shares		$ 115.00
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
Amazon Warrant | Velodyne
Class of Warrant or Right [Line Items]
Business combination, consideration transferred, warrants and rights assumed | $	$ 8.6
Amazon Warrant | Velodyne | Expected term (years) | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs | year	6.98
Amazon Warrant | Velodyne | Expected volatility | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs	0.537
Amazon Warrant | Velodyne | 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 | Expected dividend rate | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs	0
Amazon Warrant, Common Stock Vested | Velodyne
Class of Warrant or Right [Line Items]
Business combination, consideration transferred, warrants and rights assumed | $	$ 8.6
Sponsor | Private Placement Warrants
Class of Warrant or Right [Line Items]
Warrant liabilities | $		$ 19.4
Sponsor | Private Placement Warrants | Sponsor
Class of Warrant or Right [Line Items]
Warrants issued, number of preferred stock callable (in shares)		600,000
Redeem of warrants, price (in dollars per share) | $ / shares		$ 10.00
Warrant, aggregated purchase price | $		$ 6.0
Warrant, exercisable, threshold period		12 months
Warrant, expiration period		5 years
Warrants issued, exercise price (in dollars per share) | $ / shares								$ 115.00
Sponsor | Private Placement 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
Amazoncom NV Investment Holdings LLLC | Amazon Warrant | Velodyne
Class of Warrant or Right [Line Items]
Warrants issued, number of preferred stock callable (in shares)	3,263,898		3,266,237	3,266,237	3,266,237
Warrants issued, exercise price (in dollars per share) | $ / shares	$ 50.71
Number of shares issuable (in shares)			121
Vesting schedule of warrant, percent	50.00%
Class of warrant or right, vesting payments to be received | $	$ 100.0
Warrants vested during period (in shares)			56,709
Amazoncom NV Investment Holdings LLLC | Amazon Warrant, Common Stock Vested | Velodyne
Class of Warrant or Right [Line Items]
Class of warrant or right, number of common shares vested (in shares)	1,848,694
Amazoncom NV Investment Holdings LLLC | Amazon Warrant, Common Stock Unvested | Velodyne
Class of Warrant or Right [Line Items]
Class of warrant or right, number of common shares unvested (in shares)	1,219,235
Number of warrants vested (in shares)			2,103,590	2,103,590	2,103,590