Employee Benefit Plan (Details) - Retirement Savings Plan - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Minimum age of employees required to be eligible for participation	21 years
Minimum working hours per year required to be eligible for participation	1000 hours
Employer's match for every dollar of the first specified percentage of payroll that employees invest	$ 0.75
Employer's matching contribution percentage	6.00%
Contributions	$ 224,000	$ 124,000