Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Distributor	Dec. 31, 2017 USD ($) Distributor	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)	Jul. 01, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net deferred revenue					$ 3,038,000					$ 3,038,000
Revenue	$ 16,031,000	$ 4,469,000	$ 3,893,000	$ 3,465,000	4,530,000	$ 2,043,000	$ 2,163,000	$ 3,009,000	$ 27,859,000	$ 11,745,000	$ 174,758,000
Number of wholesale distributors | Distributor									3	3
Percentage of product shipments to wholesale distributors									89.00%	89.00%
Deferred costs from commercial product sales					405,000					$ 405,000
Current deferred payment	36,885,000				250,000				$ 36,885,000	250,000
Long-term deferred payment	10,680,000				500,000				$ 10,680,000	$ 500,000
Maturity period of cash equivalents									90 days or less at the time of purchase	90 days from the date of purchase
Inventory charge									$ 2,212,000	$ 2,971,000	0
Prepaid expenses and other current assets	2,556,000				3,010,000				$ 2,556,000	3,010,000
Long-lived assets anticipated sale in year									1 year
Asset impairment charge										200,000	1,300,000
Purchase commitment obligation	98,300,000				109,300,000				$ 98,300,000	109,300,000
Liability for uncertainty in income taxes	0								0
Interest cost capitalized									0	0
Increase of assets and liabilities arising from operating leases upon adoption of ASU	5,000								5,000
Milestone Rights Liability | Deerfield
Summary Of Significant Accounting Policies [Line Items]
Contingent liability for milestone payments, remain payable amount	75,000,000								75,000,000
Milestone Rights Liability | Deerfield | 2019 notes
Summary Of Significant Accounting Policies [Line Items]
Long term liability	8,900,000				8,900,000				8,900,000	8,900,000
Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Prepaid expenses and other current assets	400,000				400,000				400,000	400,000
Intellectual property
Summary Of Significant Accounting Policies [Line Items]
Revenue										600,000
Maximum | Milestone Rights Liability | Deerfield
Summary Of Significant Accounting Policies [Line Items]
Contingent liability for milestone payments	90,000,000								90,000,000				$ 90,000,000
Accounting Standards Update 2014-09
Summary Of Significant Accounting Policies [Line Items]
Deferred costs from commercial product sales												$ 0
AFREZZA product sales
Summary Of Significant Accounting Policies [Line Items]
Net deferred revenue					3,000,000					3,000,000
Revenue									$ 17,276,000	9,192,000	1,895,000
AFREZZA product sales | Minimum
Summary Of Significant Accounting Policies [Line Items]
Sales return right following product expiration in months									6 months
AFREZZA product sales | Maximum
Summary Of Significant Accounting Policies [Line Items]
Sales return right following product expiration in months									12 months
AFREZZA product sales | Accounting Standards Update 2014-09
Summary Of Significant Accounting Policies [Line Items]
Net deferred revenue	0								$ 0
Collaborations and services
Summary Of Significant Accounting Policies [Line Items]
Revenue									10,583,000	250,000	$ 171,965,000
Current deferred payment	36,900,000				200,000				36,900,000	200,000
Long-term deferred payment	$ 10,700,000				$ 500,000				$ 10,700,000	500,000
Bulk insulin sales
Summary Of Significant Accounting Policies [Line Items]
Revenue										$ 1,700,000