Commitments and Contingencies - Additional Information (Detail) € in Millions			1 Months Ended			3 Months Ended		12 Months Ended
		Dec. 27, 2023 USD ($) ConsecutiveMonth	Feb. 28, 2023 USD ($)	Jun. 30, 2022 USD ($)	Nov. 30, 2021 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2024 EUR (€)	Jul. 01, 2013 USD ($)
Commitments And Contingencies [Line Items]
Operating lease costs						$ 348,000	$ 422,000
Financing liability						104,100,000		$ 104,100,000
Financing liability, long term						94,207,000		94,319,000
Financing liability, short term						$ 9,872,000		9,809,000
Supply Agreement expiration period						Dec. 31, 2034
Supply Agreement renewal period						2 years
Milestone liabilities						$ 3,452,000		3,452,000
Returns reserve for acquired product	[1]					$ 1,633,000		601,000
Effective interest rate						11.10%
Cash paid for interest on financing liability						$ 2,400,000	$ 2,400,000
Loss on purchase commitments | €									€ 58.9
Insulin
Commitments And Contingencies [Line Items]
Loss on purchase commitments						62,700,000		64,800,000
Tyvaso DPI
Commitments And Contingencies [Line Items]
Royalty commencement date		Oct. 01, 2023
Royalty termination date		Dec. 31, 2042
Equipment | V-Go
Commitments And Contingencies [Line Items]
Lease Cost				$ 14,370
Master Lease Agreement with Enterprise | Vehicle Leases
Commitments And Contingencies [Line Items]
Operating lease rent expenses						100,000
Marlborough Lease | Buildings
Commitments And Contingencies [Line Items]
Operating lease rent expenses				$ 28,895
Percentage of annual increase in lease payment				3.00%
Casper L L C
Commitments And Contingencies [Line Items]
Sale price					$ 102,300,000
Lease initial term					20 years
Lease renewal options					renewal options of five years
Lessee,option to extend [true false]					true
Operating lease costs					$ 9,500,000
Lease, description					The total annual rent under the Lease starts at approximately $9.5 million per year, subject to a 50% rent abatement during the first year of the Lease, and will increase annually by (i) 2.5% in the second through fifth year of the Lease and (ii) 3% in the sixth and each subsequent year of the Lease, including any renewal term.
Security deposit					$ 2,000,000.0
Lease repurchase description					the Company has four options to repurchase the Property, in 2026, 2031, 2036 and 2041, for the greater of (i) $102.3 million and (ii) the fair market value of the Property.
Accrued Expenses And Other Current Liabilities
Commitments And Contingencies [Line Items]
Returns reserve for acquired product						1,200,000
Minimum | Casper L L C
Commitments And Contingencies [Line Items]
Lease repurchase, amount					$ 102,300,000
Deerfield | Milestone Rights Liability
Commitments And Contingencies [Line Items]
Contingent liability remain payable										$ 55,000,000
Remaining milestone rights liability						3,900,000		3,900,000
Milestone rights liability, current						800,000		800,000
Milestone liabilities						$ 3,100,000		3,100,000
Deerfield | Milestone Rights Liability | Maximum
Commitments And Contingencies [Line Items]
Contingent liability for milestone payments										$ 90,000,000
Russell Ranch Road II LLC | Office Lease
Commitments And Contingencies [Line Items]
Operating lease rent expenses			$ 79,543
Percentage of annual increase in lease payment			3.00%
Description of right to extension of lease term						The Company has no further right to extend the lease term beyond July 31, 2028.
Russell Ranch Road II LLC | Maximum | Office Lease
Commitments And Contingencies [Line Items]
Reimbursement for tenant improvements			$ 900,000
Additional base rent concession			$ 700,000
Sagard
Commitments And Contingencies [Line Items]
Upfront proceeds		$ 150,000,000
Reimbursements		$ 400,000
Percentage of royalty on future net sales		1.00%
Sagard | Tyvaso DPI
Commitments And Contingencies [Line Items]
Purchase price		$ 200,000,000
Sagard | Net Sales Threshold A | Tyvaso DPI
Commitments And Contingencies [Line Items]
Milestone payment		50,000,000
Net sales		1,900,000,000
Sagard | Net Sales Threshold B | Tyvaso DPI
Commitments And Contingencies [Line Items]
Milestone payment		45,000,000
Net sales		$ 2,300,000,000
Number of consecutive months | ConsecutiveMonth		12
Sagard | Net Sales Thresholds A and B | Tyvaso DPI
Commitments And Contingencies [Line Items]
Net sales		$ 3,500,000,000
Sagard | Remainder of Year
Commitments And Contingencies [Line Items]
Royalties		$ 0
Sagard | Royalty Liability
Commitments And Contingencies [Line Items]
Royalty rights		1.00%
Transaction costs		$ 4,400,000
Percentage of Future Royalty Revenues		10.00%
Effective interest rate						1110.00%
Non-cash interest expense						$ 4,200,000
Non-cash revenue recognized						2,300,000		$ 2,100,000
Amortization of transaction costs						$ 100,000

[1] See Note 14 – Commitments and Contingencies.