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Stock Based Compensation - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Stock compensation expense capitalized to inventory |  | $ 300,000 | $ 0 | $ 500,000 | $ 0 |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | $ 53,900,000 |  | $ 53,900,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 7 months 6 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  | 17,271,990 |  | 17,271,990 |  | 15,161,180
Restricted common stock, vesting in equal monthly installments |  |  |  | 10 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |
Aggregate Intrinsic Value, Exercised |  |  |  | $ 5,900,000 | 3,400,000 |
Fair Value of Shares Vested |  |  |  | $ 12,200,000 | $ 9,900,000 |
Common stock reserved for future awards or option grants |  | 28,192,494 |  | 28,192,494 |  | 23,338,272
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 8.6 | $ 4.52 |
Restricted Stock Units [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  | 1,382 |  | 1,382 |  | 2,763
Equity Incentive Plan 2016 and 2020 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 25,737,116 |  | 25,737,116 |  |
Equity Incentive Plan 2018 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 6,634,333 |  | 6,634,333 |  |
Common Stock [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share purchased under employee stock purchase plan |  |  |  | 111,918 | 43,679 |
Equity Incentive Plans [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Description | In September 2018, ARS Pharma adopted the 2018 Equity Incentive Plan. As a result of the Merger, on November 8, 2022 ARS Pharma assumed Silverback’s 2016 and 2020 Equity Incentive Plans, and Employee Stock Purchase Plan (“ESPP”). There were 111,918 shares and 43,679 shares of common stock purchased under the ESPP during the six months ended June 30, 2025 and 2024, respectively. |  |  |  |  |
Equity Incentive Plans [Member] | Equity Incentive Plan 2016 and 2020 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  | 13,033,358 |  | 13,033,358 |  |
Common stock reserved for future awards or option grants |  | 7,765,139 |  | 7,765,139 |  |
Equity Incentive Plans [Member] | Equity Incentive Plan 2018 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  | 4,240,014 |  | 4,240,014 |  |
Common stock reserved for future awards or option grants |  | 297,345 |  | 297,345 |  |

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