401(k) Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Minimum service period required to qualify for 401(k) plan	1 month
Maximum wages deferred, percent	90.00%
Maximum eligible wages deferred by participants per year	$ 19,000
Minimum age for additional contribution beyond normal plan	50 years
Defined benefit plan, contributions by plan participants	$ 6,000
Employer matching contribution, percent	5.00%
Employer matching contribution	$ 1,500,000	$ 1,900,000	$ 0