Retirement Plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Minimum percentage of compensation allowed to be deferred			1.00%
Maximum percentage of compensation allowed to be deferred			100.00%
Employer matching and profit-sharing contributions	$ 0	$ 0	$ 0	$ 0