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Employee and Consultant Equity-Based Compensation - Non-Qualified Stock Option Plan (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise of options (shares) 656,846 158,743  
Outstanding (shares) 7,328,131 6,857,124 6,167,170
Non-Qualified Stock Option Plan | Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Exercise of options (shares) 280,000    
Outstanding (shares) 0    
Options available (shares) 0