Basis of Presentation and Summary of Significant Accounting Policies (Details ) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Provision for U.S. Feraheme product sales allowances and accruals
Discounts and chargebacks	$ 13,415,000	$ 9,227,000	$ 23,948,000	$ 16,720,000
Government and other rebates	3,952,000	2,732,000	7,139,000	5,119,000
Returns	146,000	239,000	372,000	432,000
Total provision for U.S. Feraheme product sales allowances and accruals	17,513,000	12,198,000	31,459,000	22,271,000
Total gross U.S. Feraheme product sales	39,738,000	29,654,000	71,059,000	55,305,000
Total provision for U.S. Feraheme product sales allowances and accruals as a percent of total gross U.S. Feraheme product sales	44.00%	41.00%	44.00%	40.00%
Current expiration for Feraheme			5 years
Product Returns
Reduction of reserve for product returns			$ 200,000