Summary of Significant Accounting Policies - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Number of business segments	1
Sumavel DosePro
Line of Credit Facility [Line Items]
Cost of goods sold mark-up, in percent	2.50%
Restricted cash	$ 8,500	$ 8,500
Endo Ventures Supply Agreement [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Term of supply agreement	8 years
Zohydro ER and Sumavel DosePro [Member]
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