Balance Sheet Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other current liabilities:
Estimated fair value of contingent consideration liability	$ 34,511	$ 33,943
Current operating lease liabilities	10,134	10,321
Accrued variable compensation	9,932	27,527
Deferred revenues	8,823	9,422
Other current liabilities	9,589	7,652
Deferred employer FICA payments	5,519	5,523
Payroll related costs	5,923	5,738
Professional fees	780	736
Accrued medical claims expense	2,162	2,405
Total	$ 87,373	$ 103,267