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Stock Based Compensation (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of service completed before eligible for coverage	4 months	1 year 1000 hours
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance	250,000
Minimum percent of fair value market option price	90.00%
Expiration date, maximum term from grant date, in years	1 year
Grant price, percent of the stock's fair value at the time of award	95.00%
ISOP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period, in years	P10Y
Number of shares available for issuance	354,877
Minimum percent of fair value market option price	100.00%
Period of incentive stock option plan, in years	10 years
Option term, in years	10 years
Term of service completed before eligible for coverage	6 months

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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