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v3.19.1

Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 plan
Summary Of Significant Accounting Policie [Abstract] |
Number of plans | 1
Maximum option expiration term | 10 years

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- Definition Maximum Term Of Options Granted For Share-based Payment Arrangement + References No definition available. + Details
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