Commitments and Contingencies - Schedule of Accrued Medical Claims (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Umbrellas insurance coverage	$ 1,000
Aggregate medical claims for umbrella insurance coverage per calendar year	9,600
Accrued medical claims	$ 1,491	$ 1,181