Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities
Accrued clinical trial and clinical supply costs	$ 2,253	$ 3,335
Accrued compensation	5,016	2,492
Accrued rebates and allowances	1,132
Accrued product costs	3,274
Accrued sales and marketing expenses	1,077	1,315
Accrued interest	619	213
Other accrued liabilities	1,801	505
Total	$ 15,172	$ 7,860