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Stock Incentive Plans - Summary of Additional Information on Stock Options Outstanding (Details)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Numbers outstanding (in shares) | shares 1,891,350
Weighted- Average Remaining Contractual Life (Years) 5 years 3 months 14 days
Weighted average exercise price (in dollars per share) $ 0.57
Number exercisable (in shares) | shares 1,541,350
Weighted average exercise price (in dollars per share) $ 0.63
$0.28 - $1.00 (in dollars per share)  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 0.09
Range of exercise prices, upper (in dollars per share) $ 1.00
Numbers outstanding (in shares) | shares 1,883,500
Weighted- Average Remaining Contractual Life (Years) 5 years 3 months 21 days
Weighted average exercise price (in dollars per share) $ 0.57
Number exercisable (in shares) | shares 1,533,500
Weighted average exercise price (in dollars per share) $ 0.63
$1.50 - $1.80 (in dollars per share)  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 1.50
Range of exercise prices, upper (in dollars per share) $ 1.80
Numbers outstanding (in shares) | shares 4,050
Weighted- Average Remaining Contractual Life (Years) 1 year 6 months 7 days
Weighted average exercise price (in dollars per share) $ 1.70
Number exercisable (in shares) | shares 4,050
Weighted average exercise price (in dollars per share) $ 1.70
$2.60 - $10.70 (in dollars per share)  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in dollars per share) 2.60
Range of exercise prices, upper (in dollars per share) $ 6.35
Numbers outstanding (in shares) | shares 3,800
Weighted- Average Remaining Contractual Life (Years) 6 months 7 days
Weighted average exercise price (in dollars per share) $ 2.60
Number exercisable (in shares) | shares 3,800
Weighted average exercise price (in dollars per share) $ 2.60