Basis of Presentation and Summary of Significant Accounting Policies (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Provision for U.S. product sales allowances and accruals
Discounts and chargebacks	$ 7,493,000	$ 5,892,000
Government and other rebates	2,387,000	1,460,000
Returns	193,000	(266,000)
Total provision for U.S. product sales allowances and accruals	10,073,000	7,086,000
Total gross U.S. product sales	25,651,000	20,712,000
Total provision for U.S. product sales allowances and accruals as a percent of total gross U.S. product sales	39.00%	34.00%
Product Returns
Current expiration period for packaged products	5 years
Reduction of reserve for product returns		500,000
Expiration period for certain manufactured Feraheme lots		2 years
Product returns provision applied to gross sales	$ 200,000	$ (300,000)