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Business Combination - Additional Details (Details) - USD ($) | Mar. 31, 2024 | Nov. 01, 2022 | Dec. 31, 2023
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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 |

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