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Stock Incentive Plans
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock Incentive Plans Stock Incentive Plans
Stock Options
The following table summarizes stock option activity for the three months ended March 31, 2020.
Options Outstanding
SharesWeighted
Average
Exercise Price
Outstanding, December 31, 20194,071,333  $0.58  
Options granted—  —  
Options expired / forfeited(1,129,983) 0.66  
Outstanding, March 31, 20202,941,350  0.55  
Exercisable, March 31, 20201,991,350  $0.65  
The following table summarizes additional information on stock options outstanding at March 31, 2020.
Options OutstandingOptions Exercisable
Range of
Exercise
Prices		Number OutstandingWeighted-
Average
Remaining Contractual Life (Years)		Weighted Average Exercise
Price		Number ExercisableWeighted Average Exercise
Price
$0.28 - $1.00
2,933,500  7.99$0.54  1,983,500  $0.64  
$1.50 - $1.80
4,050  1.77$1.70  4,050  $1.70  
$2.60 - $6.35
3,800  0.77$2.60  3,800  $2.60  
Totals2,941,350  7.97$0.55  1,991,350  $0.65  
Weighted-Average Exercisable Remaining Contractual Life (Years) 7.97
During the three months ended March 31, 2020, the Company granted no stock options to employees.
Total expense related to stock options was approximately $36,000 and $395,000 for the three months ended March 31, 2020 and 2019, respectively.
As of March 31, 2020, the Company had approximately $172,000 of total unrecognized compensation expense related to unvested stock options to recognize through 2022.
As of March 31, 2020, the intrinsic value of options outstanding was zero.