Basis of Presentation and Summary of Significant Accounting Policies (Details ) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Provision for U.S. Feraheme product sales allowances and accruals
Discounts and chargebacks	$ 10,533	$ 7,493
Government and other rebates	3,187	2,387
Returns	226	193
Total provision for U.S. Feraheme product sales allowances and accruals	13,946	10,073
Total gross U.S. Feraheme product sales	$ 31,321	$ 25,651
Total provision for U.S. Feraheme product sales allowances and accruals as a percent of total gross U.S. Feraheme product sales	45.00%	39.00%
Current expiration period for packaged products	5 years