Warrants - Narrative (Details)		1 Months Ended	3 Months Ended
	Feb. 10, 2023 USD ($) year day $ / shares shares	Aug. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2024 USD ($) year $ / shares shares	Dec. 31, 2023 year	Mar. 31, 2023 year	Feb. 28, 2022 USD ($)	Mar. 11, 2021 USD ($) $ / shares shares
Common Stock
Class of Warrant or Right [Line Items]
Proceeds from at-the-market offering, net of commissions and fees (in shares)			343,571
Private Placement Warrants | Expected term (years) | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs | year			1.94	2.19	2.95
Private Placement Warrants | Expected volatility | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs			1.0000	0.9400	0.6500
Private Placement Warrants | Risk-free interest rate | Valuation Technique, Option Pricing Model
Class of Warrant or Right [Line Items]
Warrants, fair value measurement inputs			0.0462	0.0419	0.0382
Private Placement Warrants | Sponsor
Class of Warrant or Right [Line Items]
Warrant liabilities | $		$ 19,400,000
Private Placement Warrants | Sponsor | 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
Class of Warrant or Right [Line Items]
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
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
Number of business days prior to the notice redemption date | day	3
Amazon Warrant | Velodyne
Class of Warrant or Right [Line Items]
Business combination, consideration transferred, warrants and rights assumed | $	$ 8,600,000
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 | Amazoncom NV Investment Holdings LLLC | Velodyne
Class of Warrant or Right [Line Items]
Warrants issued, number of preferred stock callable (in shares)	3,263,898		3,264,516
Warrants issued, exercise price (in dollars per share) | $ / shares	$ 50.71		$ 50.69
Number of shares issuable (in shares)			618
Vesting schedule of warrant, percent	50.00%
Class of warrant or right, vesting payments to be received | $						$ 100,000,000
Warrants vested during period (in shares)			56,634
Warrant vested, noncash reduction to revenue | $			$ 200,000
Amazon Warrant, Common Stock Vested | Velodyne
Class of Warrant or Right [Line Items]
Business combination, consideration transferred, warrants and rights assumed | $	$ 8,600,000
Amazon Warrant, Common Stock Vested | Amazoncom NV Investment Holdings LLLC | Velodyne
Class of Warrant or Right [Line Items]
Class of warrant or right, number of common shares vested (in shares)	1,848,694
Number of warrants vested (in shares)			1,990,247
Amazon Warrant, Common Stock Unvested | Amazoncom NV Investment Holdings LLLC | Velodyne
Class of Warrant or Right [Line Items]
Class of warrant or right, number of common shares unvested (in shares)	1,330,903
Sponsor | Private Placement Warrants
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 | $		$ 6,000,000
Warrant, exercisable, threshold period		12 months
Warrant, expiration period		5 years
Warrants issued, exercise price (in dollars per share) | $ / shares							$ 115.00
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 warrants included in each unit issued (in shares)		0.5
CLA | Public Warrants
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
Warrant liabilities | $							$ 17,900,000
Warrants outstanding (in shares)							999,999