Defined Contribution Plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contribution per employee, percent			6.00%
401(k) Defined Contribution Retirement Plan
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution per one dollar of employee contribution			$ 1.00
Contributions made by the employer	$ 0	$ 3,900,000	$ 4,200,000	$ 8,000,000.0