Other License Agreements and Acquired Product Rights - Additional Information (Detail)			1 Months Ended									3 Months Ended		9 Months Ended
	Jul. 12, 2017 CAD	Oct. 07, 2010 USD ($)	Oct. 31, 2017 CAD	Sep. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Aug. 31, 2017 CAD	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jun. 30, 2016 USD ($)	Feb. 28, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)
Purdue Pharma [Member] | BELBUCA [Member] | Collaborative Arrangement, Product [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Upfront and potential milestones payable | CAD	CAD 1,500,000
Milestone based payments received | CAD			CAD 1,000,000			CAD 500,000
Maximum [Member] | Purdue Pharma [Member] | BELBUCA [Member] | Collaborative Arrangement, Product [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Upfront and potential milestones payable | CAD	CAD 4,500,000
Subsequent Event [Member] | Purdue Pharma [Member] | BELBUCA [Member] | Collaborative Arrangement, Product [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Milestone based payments received | CAD			CAD 1,000,000
TTY License and Supply Agreement [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Upfront payment | $		$ 300,000
Milestone payments | $		$ 1,300,000
Term of the agreement														15 years
Milestone payment received | $				$ 300,000	$ 200,000		$ 100,000	$ 30,000	$ 200,000	$ 240,000	$ 240,000		$ 0
Milestone payment recorded in statements of operations | $												$ 500,000		$ 1,100,000