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Equity Incentive Plans - Stock Options Outstanding (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Number of Stock Options    
Beginning Balance (shares) 2,227,193  
Exercised (shares) (13,000)  
Ending Balance (shares) 2,214,193 2,227,193
Exercisable (shares) 2,189,114  
Weighted Average Grant Date Fair Value    
Beginning Balance (usd per share) $ 4.01  
Exercised (usd per share) 3.93  
Ending Balance (usd per share) 4.01 $ 4.01
Exercisable (usd per share) 4.00  
Weighted Average Exercise Price    
Beginning Balance (usd per share) 13.93  
Exercised (usd per share) 13.38  
Ending Balance (usd per share) 13.94 $ 13.93
Exercisable (usd per share) $ 13.91  
Weighted Average Contractual Life (years)    
Outstanding 4 years 5 months 15 days 4 years 11 months 15 days
Exercisable 4 years 5 months 12 days