Balance Sheet Components, Components of Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Components [Abstract]
Accrued variable compensation	$ 15,050	$ 15,060
Deferred revenues	5,414	5,945
Payroll related costs	2,906	2,358
Accrued subcontractor fees	771	871
Accrued medical claims expense	1,816	1,615
Professional Fees	726	1,394
Estimated fair value of contingent consideration liability (Note 6)	5,904	0
Net working capital settlements	1,008	518
Other current liabilities	4,188	5,267
Total	$ 37,783	$ 33,028