Description of Business and Significant Accounting Policies - Additional Information (Detail)		1 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 06, 2019 USD ($) $ / shares	Aug. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($) Contract $ / shares	Dec. 31, 2018 USD ($) Contract	Aug. 05, 2019 $ / shares
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Accumulated deficit				$ (2,977,640,000)	$ (2,940,000,000)
Principal amount				120,100,000
Cash and cash equivalents				30,173,000	71,157,000
Short-term investments				19,885,000
Remaining debt amount				$ 70,019,000	72,089,000
Conversion price of shares | $ / shares				$ 3.00
(“ASC”) Topic 842 – Leases
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase in total assets and total liabilities				$ 5,200,000
Short-term Investments
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Gain (loss) on investments				0
Insulin
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on purchase commitments				$ 89,500,000	$ 98,300,000
Loss on purchase commitments, number of new contracts recognized | Contract				0	0
Maximum | AFREZZA product sales
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Sales return right following product expiration in months				12 months
Minimum | AFREZZA product sales
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Sales return right following product expiration in months				6 months
The Mann Group LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Remaining debt amount			$ 72,000,000
Facility Financing Obligation | Deerfield
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Repayments of aggregate principal amount				$ 5,000,000
Convertible Promissory Note | The Mann Group LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount			80,600,000	35,000,000
Repayments of debt				$ 11,000,000
Remaining debt amount			$ 70,100,000
Maturity period, month and year			2021-07
Conversion price of shares | $ / shares			$ 4.00	$ 2.50
Convertible Promissory Note | The Mann Group LLC | New Loan Arrangement
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Maturity period, month and year				2024-11
Conversion price of shares | $ / shares				$ 2.50		$ 2.50
Non-Convertible Promissory Note | The Mann Group LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				$ 35,100,000
Non-Convertible Promissory Note | The Mann Group LLC | New Loan Arrangement
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				35,100,000
2021 Notes
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				10,200,000
Repayments of aggregate principal amount				8,500,000
June 2020 Note
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				$ 2,600,000
Maturity period, month and year				2020-06
December 2020 Note
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				$ 2,600,000
Maturity period, month and year				2020-12
2024 Convertible Notes
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				$ 5,000,000
Maturity period, month and year				2024-11
Conversion price of shares | $ / shares	$ 3.00
MidCap Credit Facility
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Principal amount				$ 40,000,000
Principal amount	$ 75,000,000	$ 75,000,000
Amount outstanding				40,000,000
Amount available under credit facility		35,000,000
MidCap Credit Facility | Tranche 2
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Advance of borrowing	10,000,000	10,000,000
Debt instrument, minimum target net revenue	30,000,000	30,000,000
Minimum cash covenant	15,000,000			15,000,000
MidCap Credit Facility | Tranche 3
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Advance of borrowing	25,000,000	$ 25,000,000
Minimum cash covenant	$ 20,000,000			$ 20,000,000