Prepaid Expenses and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Prepaid Expenses and Other Assets
Prepaid insurance	$ 3,617	$ 6,979
Prepaid sales and marketing expenses	5,187	5,735
Prepaid medical affairs expenses	444	1,782
Manufacturing capacity commitment fees	461	2,300
Withholding tax receivable	5,560
Debt issuance costs	1,247
Other prepaid expenses and assets	3,422	2,363
Total	$ 19,938	$ 19,159