401(K) and Other Defined Contribution Plans (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Retirement Savings Plan Section 401k [Member]
Defined Contribution Plan Disclosure [Line Items]
Matching contributions to employees	$ 310,000	$ 304,000
Defined Contribution Retirement Savings Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Matching contributions to employees	$ 32,000	$ 30,000

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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