Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 03, 2013
Revenue Recognition
Reduction in net revenues		$ 144,427	$ 122,045	$ 12,019
Accrued sales deductions		$ 26,794	8,461
Sales return period prior to expiry date		6 months
Sales return period subsequent to expiry date		12 months
Revenue From Royalty Agreement	$ 30,000		30,000
Milestone revenues recorded		$ 800	2,000	0
Selling, General and Administrative
Advertising Expense
Advertising costs		$ 19,300	$ 14,800	$ 14,600
7.50% Convertible Senior Secured Notes due 2019
Notes payable
Fixed interest rate (as a percent)		7.50%			7.50%
Sales deductions
Revenue Recognition
Reduction in net revenues		$ 2,900
Accrued sales deductions		$ 26,800