Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accrued Liabilities
Accrued clinical trial and clinical supply costs	$ 877	$ 2,253
Accrued compensation	5,011	5,016
Accrued sales rebates and allowances	7,298	1,903
Accrued product costs	1,909	2,503
Accrued sales and marketing expenses	807	1,077
Accrued interest	1,292	619
Other accrued liabilities	3,216	1,801
Total	$ 20,410	$ 15,172