Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities
Accrued clinical trial and clinical supply costs	$ 538	$ 2,253
Accrued compensation	3,829	5,016
Accrued rebates and allowances	2,817	1,903
Accrued product costs	517	2,503
Accrued sales and marketing expenses	1,540	1,077
Accrued interest	1,251	619
Other accrued liabilities	1,998	1,801
Total	$ 12,490	$ 15,172