Product Revenues, Net (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Product Revenue Allowance and Reserve [Roll Forward]
Balance at December 31, 2014	$ 36,023
Provision related to current period sales	24,602
Adjustments related to prior period sales	(7,254)
Credits/payments made	(20,938)
Balance at June 30, 2015	32,433
Trade Allowances
Product Revenue Allowance and Reserve [Roll Forward]
Balance at December 31, 2014	1,463
Provision related to current period sales	2,865
Adjustments related to prior period sales	(86)
Credits/payments made	(2,985)
Balance at June 30, 2015	1,257
Rebates, Chargebacks and Discounts
Product Revenue Allowance and Reserve [Roll Forward]
Balance at December 31, 2014	29,102
Provision related to current period sales	20,305
Adjustments related to prior period sales	(5,958)
Credits/payments made	(13,654)
Balance at June 30, 2015	29,795
Product Returns
Product Revenue Allowance and Reserve [Roll Forward]
Balance at December 31, 2014	4,713
Provision related to current period sales	181
Adjustments related to prior period sales	(975)
Credits/payments made	(3,194)
Balance at June 30, 2015	725
Other Incentives
Product Revenue Allowance and Reserve [Roll Forward]
Balance at December 31, 2014	745
Provision related to current period sales	1,251
Adjustments related to prior period sales	(235)
Credits/payments made	(1,105)
Balance at June 30, 2015	$ 656