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Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Sep. 30, 2018	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock compensation expense capitalized to inventory		$ 0.4	$ 0.2
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 65.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		2 years 8 months 12 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number		20,325,316		16,744,639
Restricted common stock, vesting in equal monthly installments		10 years
Aggregate Intrinsic Value, Exercised		$ 0.1	1.3
Fair Value of Shares Vested		$ 6.2	$ 6.2
Common stock reserved for future awards or option grants		33,254,561		27,599,226
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 8.41	$ 8.06
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		0		1,382
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		30,701,662
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
Common Stock [Member]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share purchased under employee stock purchase plan		0	0
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 no shares of common stock purchased under the ESPP during the three months ended March 31, 2026 and 2025.
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		16,401,521
Common stock reserved for future awards or option grants		9,163,881
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		3,923,795
Common stock reserved for future awards or option grants		297,345