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Collaborations and Licensing Arrangements - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	May 31, 2018	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Oct. 31, 2018	Sep. 30, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services			$ 15,352,000		$ 14,595,000	$ 46,701,000	$ 47,045,000
Deferred revenue — current			28,867,000			28,867,000			$ 32,503,000
Prepaid expenses and other current assets			4,616,000			4,616,000			2,889,000
Accounts receivable, net			4,135,000			4,135,000			3,513,000
Deferred revenue — long term			1,699,000			1,699,000			$ 8,344,000
Collaborations and services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services			8,077,000		8,193,000	24,441,000	29,502,000
AFREZZA product sales
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services			7,275,000		6,402,000	22,260,000	17,543,000
Collaboration and License Agreement \| Receptor CLA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue — current			100,000			100,000
Collaboration and License Agreement \| Collaborations and services \| Receptor CLA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services			63,000		62,000	188,000	187,000
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
Potential milestone payments to be receive			12,500,000			12,500,000
Deferred revenue — current			28,700,000			28,700,000
Collaboration and License Agreement \| United Therapeutics Corporation \| Clinical Supplies
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total transaction price			102,600,000			102,600,000
Deferred revenue — current			1,200,000			1,200,000
Prepaid expenses and other current assets			800,000			800,000
Accounts receivable, net			400,000			400,000
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 \| United Therapeutics Corporation \| Collaborations and services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services						400,000
Research Agreement \| United Therapeutics Corporation
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront payment received											$ 10,000,000.0
Total transaction price			10,000,000.0			10,000,000.0
Research Agreement \| United Therapeutics Corporation \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Potential milestone payments to be receive	$ 30,000,000.0				30,000,000.0		30,000,000.0
Research Agreement \| United Therapeutics Corporation \| Collaborations and services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services					158,000	211,000	5,874,000
Research Agreement \| United Therapeutics Corporation \| Product Prototype
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total transaction price			9,000,000.0			$ 9,000,000.0
Revenue performance obligation, method used						The revenue for the product prototype was recognized using an output method (based on project milestones achieved and surveys of performance completed to date). The Company believed that this method best reflected the measure of progress toward complete satisfaction of the performance obligation.
Research Agreement \| United Therapeutics Corporation \| Engineering Consulting Services
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total transaction price			1,000,000.0			$ 1,000,000.0
Revenue performance obligation, method used						The revenue for the engineering consulting services was recognized using a ratable method until the obligation was satisfied. The Company believed that this method best reflected the measure of progress toward complete satisfaction of the performance obligation.
Supply and Distribution Agreement \| AFREZZA product sales \| Biomm
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services	$ 700,000		0	$ 200,000
License and Distribution Agreement \| Foreign Country \| India Tax Authority
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Income Taxes Paid								$ 200,000
Income tax receivable			200,000			$ 200,000
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			1,800,000			1,800,000
Deferred revenue — long term			1,700,000			1,700,000
License and Distribution Agreement \| Collaborations and services \| Cipla Ltd
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue' collaborations and services			$ 36,000		$ 37,000	$ 108,000	$ 111,000