Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued Liabilities
Accrued sales deductions	$ 14,114	$ 8,461
Accrued compensation	6,493	5,829
Accrued professional fees	4,461	2,049
Accrued product costs	2,813	3,014
Accrued clinical trial and clinical supply costs	715	2,942
Accrued sales and marketing expenses	650	1,017
Accrued interest expense	322	639
Other accrued liabilities	2,185	1,536
Total	$ 31,753	$ 25,487