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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