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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Shares    
Award contractual life 10 years  
2013 Equity Incentive Plan    
Shares    
Outstanding, beginning balance (in shares) 287,990  
Granted, Shares 0  
Less exercised (in shares) 9,398  
Forfeited or Expired, Shares 0  
Outstanding, ending balance (in shares) 278,592 287,990
Expected to vest, assuming a 0.31% annual forfeiture rate (in shares) 277,770  
Exercisable (in shares) 147,937  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expected Forfeiture Rate 0.31%  
Expected forfeiture rate over contractual term 3.10%  
Weighted-Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 36.98  
Granted (in dollars per share) 0.00  
Less exercised (in dollars per share) 16.89  
Forfeited or expired, Weighted-Average Exercise Price (in dollars per share) 0.00  
Outstanding, ending balance (in dollars per share) 37.65 $ 36.98
Expected to vest, assuming a 0.31% annual forfeiture rate (in dollars per share) 37.60  
Exercisable (in dollars per share) $ 22.53  
Weighted-Average Remaining Contractual Term In Years    
Outstanding, beginning balance   6 years 9 months 7 days
Outstanding, ending balance 6 years 6 months 26 days  
Expected to vest, assuming a 0.31% annual forfeiture rate, Weighted Average Remaining Contractual Term 6 years 6 months 26 days  
Exercisable 4 years 7 months 17 days  
Aggregate Intrinsic Value    
Beginning balance $ 7,722,369  
Granted $ 0  
Less exercised $ 350,414  
Forfeited or Expired, Aggregate Intrinsic Value 0  
Ending balance 2,444,876 $ 7,722,369
Expected to vest, assuming a 0.31% annual forfeiture rate 2,444,876  
Exercisable $ 2,444,876