Retirement Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Employer contribution amount	$ 208	$ 201
Maximum
Defined Contribution Plan Disclosure [Line Items]
Discretionary matching contributions (as a percent)	3.00%	3.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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