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Stock-Based Compensation - Stock Option Awards Outstanding By Exercise Price (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options Outstanding  
Options Outstanding (shares) | shares 5,327,756
Weighted Average Remaining Contractual Life (Years) 3 years 11 months 15 days
Weighted Average Exercise Price Per Share (usd per share) $ 3.70
Options Exercisable  
Options Exercisable (shares) | shares 3,593,624
Weighted Average Remaining Contractual Life (Years) 2 years 8 months 26 days
Weighted Average Exercise Price Per Share (usd per share) $ 4.00
$1.11 - $1.94  
Stock option awards  
Range of Exercise Prices, low end (usd per share) 1.11
Range of Exercise Prices, high end (usd per share) $ 1.94
Options Outstanding  
Options Outstanding (shares) | shares 658,915
Weighted Average Remaining Contractual Life (Years) 2 years 3 months
Weighted Average Exercise Price Per Share (usd per share) $ 1.86
Options Exercisable  
Options Exercisable (shares) | shares 635,477
Weighted Average Remaining Contractual Life (Years) 2 years 6 months 18 days
Weighted Average Exercise Price Per Share (usd per share) $ 1.85
$2.00 - $2.88  
Stock option awards  
Range of Exercise Prices, low end (usd per share) 2.00
Range of Exercise Prices, high end (usd per share) $ 2.88
Options Outstanding  
Options Outstanding (shares) | shares 1,305,000
Weighted Average Remaining Contractual Life (Years) 5 years 11 months 1 day
Weighted Average Exercise Price Per Share (usd per share) $ 2.40
Options Exercisable  
Options Exercisable (shares) | shares 894,269
Weighted Average Remaining Contractual Life (Years) 4 years 9 months 14 days
Weighted Average Exercise Price Per Share (usd per share) $ 2.45
$3.60 - $4.83  
Stock option awards  
Range of Exercise Prices, low end (usd per share) 3.60
Range of Exercise Prices, high end (usd per share) $ 4.83
Options Outstanding  
Options Outstanding (shares) | shares 1,921,869
Weighted Average Remaining Contractual Life (Years) 4 years 10 days
Weighted Average Exercise Price Per Share (usd per share) $ 4.22
Options Exercisable  
Options Exercisable (shares) | shares 1,463,677
Weighted Average Remaining Contractual Life (Years) 2 years 7 months 9 days
Weighted Average Exercise Price Per Share (usd per share) $ 4.18
$5.01 - $5.90  
Stock option awards  
Range of Exercise Prices, low end (usd per share) 5.01
Range of Exercise Prices, high end (usd per share) $ 5.90
Options Outstanding  
Options Outstanding (shares) | shares 1,019,324
Weighted Average Remaining Contractual Life (Years) 2 years 9 months
Weighted Average Exercise Price Per Share (usd per share) $ 5.56
Options Exercisable  
Options Exercisable (shares) | shares 437,037
Weighted Average Remaining Contractual Life (Years) 8 months 15 days
Weighted Average Exercise Price Per Share (usd per share) $ 5.57
$6.75 - $8.37  
Stock option awards  
Range of Exercise Prices, low end (usd per share) 6.75
Range of Exercise Prices, high end (usd per share) $ 8.37
Options Outstanding  
Options Outstanding (shares) | shares 422,648
Weighted Average Remaining Contractual Life (Years) 4 years 9 months 29 days
Weighted Average Exercise Price Per Share (usd per share) $ 8.17
Options Exercisable  
Options Exercisable (shares) | shares 163,164
Weighted Average Remaining Contractual Life (Years) 3 years 10 days
Weighted Average Exercise Price Per Share (usd per share) $ 7.59