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Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2017 plan
Summary Of Significant Accounting Policie [Abstract]
Number of plans	1
Maximum option expiration term	10 years

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Maximum Term Of Options Granted For Share-based Payment Arrangement

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Number Of Stock Option Plans

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Summary Of Significant Accounting Policie [Abstract]

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