Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Payroll and other employee related costs	$ 15,282	$ 15,373
Professional services and consulting and other vendor fees	14,587	9,258
Sales commissions	3,792	3,268
Contingent earnout (see Notes 8 and 9)	782	6,940
Other	2,459	2,933
Total	$ 36,902	$ 37,772