Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued Liabilities [Abstract]
Accrued payroll and employee-related expenses	$ 21,483	$ 11,808
Accrued legal costs	4,793	134
Accrued sales, income and excise taxes	1,847	1,659
Accrued clinical study expense	1,358	872
Deferred rent	1,214	1,204
Accrued royalties	841	571
Accrued interest on convertible notes	503	0
Contingent consideration, current portion	143	500
Other accrued expenses	4,092	3,286
Total accrued liabilities	36,274	20,034
Less: long-term portion	(1,222)	(1,215)
Accrued liabilities, current portion	$ 35,052	$ 18,819