Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of terms of share-based payment arrangement. Includes, but is not limited to, type of award or grantee and reason for issuance.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Percentage of vesting of award under share-based payment arrangement.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Sep. 30, 2018	Mar. 31, 2023	Mar. 31, 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		$ 29.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		3 years 2 months 4 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number		15,584,419		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		$ 2.4
Fair Value of Shares Vested		$ 0.7	$ 0.1
Common stock reserved for future awards or option grants		19,640,465		15,448,012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 6.50	$ 1.57
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		7,107		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
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
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”). For the three months ended March 31, 2023, ESPP activity is not material to the condensed consolidated financial statements.
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		9,956,626
Common stock reserved for future awards or option grants		3,754,826
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
Common stock reserved for future awards or option grants		294,113