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Collaboration, Licensing and Other Arrangements - Additional Information (Detail) - USD ($)		1 Months Ended				3 Months Ended			9 Months Ended		12 Months Ended	20 Months Ended
	Jul. 01, 2021	May 31, 2021	Dec. 31, 2020	Sep. 30, 2019	May 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Nov. 30, 2020	Aug. 31, 2021	Aug. 12, 2021	Jun. 30, 2021	Oct. 31, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from related party		$ 5,300,000
Deferred revenue - current			$ 33,275,000			$ 14,016,000			$ 14,016,000		$ 33,275,000
Revenue' collaborations and services						22,211,000	$ 15,352,000		62,927,000	$ 46,701,000
Deferred revenue - long term			1,662,000			1,552,000			1,552,000		1,662,000
Collaborations and services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services						12,458,000	8,077,000		35,099,000	24,441,000
Commercial product sales
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services						9,753,000	7,275,000		27,828,000	22,260,000
Collaboration and License Agreement \| United Therapeutics Corporation
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront payment received																$ 45,000,000.0
Milestone Payment Received												$ 12,500,000
Total transaction price		$ 50,200,000													$ 50,900,000
Increase in total consideration			$ 2,700,000
Deferred revenue - current						13,800,000			13,800,000
Collaboration and License Agreement \| United Therapeutics Corporation \| Additional Clinical Supplies
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total transaction price															$ 700,000
Collaboration and License Agreement \| United Therapeutics Corporation \| Manufacturing Services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized during period						0			0
Collaboration and License Agreement \| United Therapeutics Corporation \| Clinical Supplies
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total transaction price						105,800,000			105,800,000
Collaboration and License Agreement \| United Therapeutics Corporation \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Additional option exercise and development milestone payments to be receive						40,000,000.0			$ 40,000,000.0
Collaboration and License Agreement \| Tyvaso DPI
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total anticipated cash flows													$ 221,500,000	$ 221,500,000
Commercial Supply Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Amendment description									As amended by an amendment dated October 16, 2021, the term of the CSA continues until December 31, 2031 (unless earlier terminated) and is thereafter renewed automatically for additional, successive two-year terms unless (i) United Therapeutics provides notice to the Company at least 24 months in advance of such renewal that United Therapeutics does not wish to renew the CSA or (ii) the Company provides notice to United Therapeutics at least 48 months in advance of such renewal that the Company does not wish to renew the CSA
Co-Promotion Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Impairment on contract assets related to variable consideration						0			$ 100,000
Co-Promotion Agreement \| Vertice Pharma LLC
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total transaction price						6,300,000			6,300,000
Co-Promotion Agreement \| Collaborations and services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Reserve for allowance for doubtful accounts						800,000			800,000
Co-Promotion Agreement \| Collaborations and services \| Vertice Pharma LLC
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services									1,147,000
Amendment to Co Promotion Agreement \| Vertice Pharma LLC
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Percentage of modification of previously fixed consideration	50.00%
Supply and Distribution Agreement \| Commercial product sales \| Biomm
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services				$ 700,000				$ 200,000	0		$ 0
License and Distribution Agreement \| Cipla Ltd
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue - current						100,000			100,000
Marketing and distribution agreement date					2018-05
Deferred revenue						1,700,000			1,700,000
Deferred revenue - long term						1,600,000			1,600,000
License and Distribution Agreement \| Collaborations and services \| Cipla Ltd
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services						$ 37,000	$ 36,000		$ 110,000	$ 108,000