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Warrants - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 26 Months Ended
Feb. 10, 2023
USD ($)
year
day
$ / shares
shares
Aug. 31, 2020
USD ($)
$ / shares
shares
Jun. 30, 2024
year
$ / shares
shares
Jun. 30, 2024
year
$ / shares
shares
Dec. 31, 2023
year
Jun. 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)     1,489,300 5,495,117      
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     1.7 1.7 2.2 2.7  
Private Placement Warrants | Expected volatility | Valuation Technique, Option Pricing Model              
Class of Warrant or Right [Line Items]              
Warrants, fair value measurement inputs     0.9800 0.9800 0.9400 0.8000  
Private Placement Warrants | Risk-free interest rate | Valuation Technique, Option Pricing Model              
Class of Warrant or Right [Line Items]              
Warrants, fair value measurement inputs     0.0483 0.0483 0.0419 0.0461  
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   3,266,116 3,266,116      
Warrants issued, exercise price (in dollars per share) | $ / shares $ 50.71   $ 50.66 $ 50.66      
Number of shares issuable (in shares)     2,218        
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)     56,634        
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)     2,046,881 2,046,881