Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 01, 2015	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Common stock conversion ratio	0.125
Number of business segments | segment		1
Unrealized loss on available-for-sale securities		$ (3,933)	$ 0	$ (5,485)	$ 0
Impairment loss on investments		5,485	$ 0	5,485	$ 0
Zohydro ER
Line of Credit Facility [Line Items]
Restricted cash		10,001		$ 10,001
Sumavel DosePro
Line of Credit Facility [Line Items]
Cost of goods sold mark-up, in percent				2.50%
Restricted cash						$ 8,500
Endo Ventures Supply Agreement | Minimum
Line of Credit Facility [Line Items]
Term of supply agreement				8 years
Zohydro ER and Sumavel DosePro
Line of Credit Facility [Line Items]
Period to accept returned unused product prior to expiration				6 months
Period to accept returned unused product after product expiration				12 months
Short-term investments
Line of Credit Facility [Line Items]
Available-for-sale Securities		5,300		$ 5,300
Discount for lack of marketability		200		200
Unrealized loss on available-for-sale securities		3,900		5,500
Impairment loss on investments		$ 5,500		$ 5,500