Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Commitments [Line Items]
Commitments to be paid	$ 11,700
Commitments to be paid in 2021	9,300
Commitments to be paid in 2022	1,500
Commitments to be paid in 2023 through 2025	300
Employees under contract terminated by employer without good cause or change in control	45,000
Employees under contract terminated by employer without good cause or in absence of change in control	17,200
Letter of Credit | Line of Credit
Other Commitments [Line Items]
Letters of credit outstanding	$ 1,500	$ 3,400
Minimum
Other Commitments [Line Items]
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements	6 months
Severance payment as a percentage of annual salary	100.00%
Severance payment as a percentage of annual bonus	50.00%
Maximum
Other Commitments [Line Items]
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements	3 years
Severance payment as a percentage of annual salary	300.00%
Severance payment as a percentage of annual bonus	300.00%