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Summary of Significant Accounting Policies (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of Significant Accounting Policies (Textual)        
Incremental shares related to stock options, restricted stock and convertible debt 1,187 3,049 2,170 2,853