Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Payroll and other employee related costs	$ 14,073	$ 15,373
Professional services and consulting and other vendor fees	8,505	9,258
Sales commissions	1,598	3,268
Contingent earnout (see Notes 8 and 9)	5,847	6,940
Other	2,486	2,933
Total	$ 32,509	$ 37,772