Commitments and Contingencies - Schedule of Accrued Medical Claims (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Aggregate medical claims for umbrella insurance coverage per calendar year	$ 6,000
Accrued medical claims	$ 1,439	$ 1,329

Carrying value as of the balance sheet date of obligations incurred through that date and payable related to accrued medical claims.

No definition available.