Employee 401(k) Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Maximum percentage of pretax salary, which can be deferred by employees	75.00%
Maximum amount of wages, which can be deferred by employees	$ 19,000
Maximum amount of wages, which can be deferred by employees at least 50 years of age	$ 25,000
Minimum age of employees for a specified contribution amount of wages	50 years
Percentage of employee's salary for which the company contributes a matching contribution	50.00%
Maximum amount of employee's salary for which the company contributes a matching contribution	$ 12,500,000
Amount of employer contribution	$ 500,000	$ 300,000