License Agreements - Additional Information (Detail) - USD ($)		1 Months Ended					3 Months Ended
	Oct. 05, 2011	Feb. 29, 2016	Jan. 31, 2015	Oct. 31, 2014	Jan. 31, 2014	Mar. 31, 2012	Mar. 31, 2016	Mar. 31, 2015
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration revenue							$ 720,000	$ 618,000
Teva Pharmaceuticals USA, Inc. [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Common stock shares issued during the period		2,172,886
Grupo Ferrer Internacional, S.A. [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront cash received under collaborative arrangement	$ 10,000,000
Eligible receipt of additional milestone payments	51,000,000						$ 40,000,000
License agreement contractual terms							until the later of the last to expire patent covering ADASUVE in such country or 12 years after first commercial sale.
License agreement term period							12 years
Common stock shares issued during the period				2,000,000
Common stock price, per share				$ 4.00
Purchase of common stock, value				$ 8,000,000
Estimated performance period of agreement							4 years
Upfront cash received under collaborative arrangement					$ 1,000,000
Collaboration revenue							$ 712,000	$ 612,000
Deferred revenue							$ 2,136,000
Grupo Ferrer Internacional, S.A. [Member] | Upfront payment [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Premium on the fair value from sale of stock, classified as deferred revenue				$ 2,400,000		$ 1,452,000
Grupo Ferrer Internacional, S.A. [Member] | Symphony Allegro Incorporation [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payments To Former Allegro Stockholders			$ 865,000
Symphony Allegro Incorporation [Member] | Grupo Ferrer Internacional, S.A. [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payments to former stockholders under collaborative arrangement	$ 5,000,000				$ 250,000