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Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | $ 30.2 | $ 30.2 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 2 years 11 months 4 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  | 15,383,418 | 15,383,418 |  | 12,063,560
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 |  |  | $ 5.7 | $ 1.2 |
Fair Value of Shares Vested |  |  | $ 1.6 | $ 0.4 |
Common stock reserved for future awards or option grants |  | 18,832,895 | 18,832,895 |  | 15,448,012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 6.31 | $ 2.31 |
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 |  | 5,082 | 5,082 |  | 10,651
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 |  | 16,018,660 | 16,018,660 |  |
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 |  | 21,899 | 21,899 |  |
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, as the accounting acquirer, is deemed to have assumed Silverback’s 2016 and 2020 Equity Incentive Plans, and Employee Stock Purchase Plan (“ESPP”). During the three and six months ended June 30, 2023, there were 21,899 shares of common stock purchased under the ESPP. |  |  |  |
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 |  | 9,753,600 | 9,753,600 |  |
Common stock reserved for future awards or option grants |  | 3,104,826 | 3,104,826 |  |
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 |  | 5,634,900 | 5,634,900 |  |
Common stock reserved for future awards or option grants |  | 294,113 | 294,113 |  |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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