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Stock-Based Compensation - 2018 Plan (Details) - shares
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Options      
Stock Options      
Service period 4 years    
Contractual life of stock options 10 years    
Options | Directors      
Stock Options      
Service period 1 year    
Vesting period 1 year    
Options | Directors | Minimum      
Stock Options      
Service period 1 year    
Options | Directors | Maximum      
Stock Options      
Service period 2 years    
Options | Vesting after first year of service      
Stock Options      
Percentage of shares to vest 25.00%    
Options | Vesting in years two through four      
Stock Options      
Vesting period 36 months    
Stock Incentive Plan 2018      
Stock Options      
Number of shares reserved for issuance (in shares) 2,126,440   1,386,809
Number of additional shares reserved for issuance, maximum (in shares)   739,631  
Number of additional shares reserved for issuance, percentage, maximum   4.00%  
Number of shares available for issuance (in shares) 1,270,322