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Stock Options (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Key weighted-average assumptions used to apply this pricing model during the years ended December 31, 2020 and 2019 were as follows:
For the Years Ended December 31,
20202019
Risk-free interest rate
0.33-0.35%
1.77-2.66%
Expected life of option grants5 years7 years
Expected volatility of underlying stock
34.43%
49.48-106.16%
Dividends assumption$— $— 
Schedule of Stock Options Roll Forward
The following table summarizes the changes in options outstanding during the years ended December 31, 2020 and 2019:
Number
of
Options
Weighted
Average
Exercise
Price
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 20191,624 $5,229.00 — 
Granted130,651 61.79 — 
Exercised(14)— — 
Expired(2,106)353.19 — 
Forfeitures(8,359)91.67 — 
Outstanding at December 31, 2019121,796 $123.66 — 
Granted5,567,500 1.10 — 
Exercised— — — 
Expired(37,404)272.92 — 
Forfeitures(201,835)1.26 — 
Outstanding at December 31, 20205,450,057 $23.76 — 
Exercisable at December 31, 201977,576 $167.88 — 
Exercisable at December 31, 20201,752,968 $70.84 —