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Business Combination - Additional Details (Details) - USD ($)
Mar. 31, 2024
Nov. 01, 2022
Dec. 31, 2023
Business Combination, Separately Recognized Transactions [Line Items]      
Proceeds from consummation of separation transaction   $ 1,800,000  
Common shares, par value, (dollars per share) $ 0.0001 $ 0.001 $ 0.0001
Preferred stock, par value, (dollars per share) 0.0001   $ 0.0001
Contingent consideration, liability, share   1  
Shares cancelled in exchange for common stock (in shares)   1  
Earnout shares (in shares)   14,999,243  
VWAP trading price (dollars per share) $ 12.50 $ 12.50  
Threshold trading days   20 days  
Threshold consecutive trading days   30 days  
Warrant price (dollars per share)   $ 11.50  
Avista Acquisition LP II      
Business Combination, Separately Recognized Transactions [Line Items]      
Earnout Founder Shares (in shares)   1,293,299  
Amended and Restated Forward Purchase Agreement      
Business Combination, Separately Recognized Transactions [Line Items]      
Issuance of common stock (in shares)   1,500,000  
Consideration received   $ 15,000,000  
Amended and Restated Forward Purchase Agreement - Backstop      
Business Combination, Separately Recognized Transactions [Line Items]      
Issuance of common stock (in shares)   8,672,934  
Consideration received   $ 86,700,000  
Public Warrants      
Business Combination, Separately Recognized Transactions [Line Items]      
Shares cancelled in exchange for common stock (in shares) 1    
Shares vesting upon first achievement, percentage   50.00%  
Threshold trading days 20 days 20 days  
Threshold consecutive trading days 30 days 30 days  
Threshold after closing date 5 years 5 years  
Warrants outstanding (in shares)   7,666,667  
Forward Purchase Warrants      
Business Combination, Separately Recognized Transactions [Line Items]      
Warrants outstanding (in shares)   1,666,667  
Backstop warrants      
Business Combination, Separately Recognized Transactions [Line Items]      
Warrants outstanding (in shares)   1,445,489  
Warrant price (dollars per share)   $ 10.00  
Amended and Restated Forward Purchase Agreement | Sponsor | Avista Public Acquisition Corp. II      
Business Combination, Separately Recognized Transactions [Line Items]      
Maximum additional aggregate purchase price   $ 100,000,000  
New OmniAb Common Stock      
Business Combination, Separately Recognized Transactions [Line Items]      
Common shares, par value, (dollars per share)   $ 0.0001  
Preferred stock, par value, (dollars per share)   $ 0.0001  
Shares cancelled in exchange for common stock (in shares)   4.90007  
Shares issued during separation (in shares)   82,611,789  
Earnout shares      
Business Combination, Separately Recognized Transactions [Line Items]      
Commons stock subject to price-based earnout triggers (in shares)   0.75842  
VWAP trading price (dollars per share) $ 15.00 $ 15.00