Balance Sheet Components, Other Current Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Balance Sheet Components [Abstract]
Accrued variable compensation		$ 8,056	$ 15,050
Deferred revenues		3,612	5,414
Payroll related costs		2,746	2,906
Accrued subcontractor fees		1,012	771
Accrued medical claims expense		1,871	1,816
Professional Fees		146	726
Estimated fair value of contingent consideration liability	[1]	1,333	5,904
Net working capital settlements		0	1,008
Other current liabilities		3,729	4,188
Total		$ 22,505	$ 37,783

[1] As of September 30, 2016, represents the fair value estimate of additional earnings-based contingent consideration that may be realized by Enlighten and Market Street's selling shareholders 12 months after the applicable acquisition. As of December 31, 2015, represents the fair value estimate of additional earnings-based contingent consideration that may be realized by Zeon, Enlighten and Market Street's selling shareholders 12 months after the applicable acquisition.