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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2021
Stockholders' Equity Note [Abstract]  
Key Assumptions Used in Determining Fair Value of Options Granted
The key assumptions used in determining the fair value of options granted during the nine months ended September 30, 2021 follows:
Expected price volatility
53.70%-59.87%
Risk-free interest rate
0.50%-1.17%
Weighted average expected life in years6 years
Dividend yield— 
Summary of Stock Option Activity Option activity during the nine months ended September 30, 2021 was as follows:
Number of
shares		Weighted average
exercise price per
share		Aggregate
intrinsic
value
Outstanding at January 1, 20217,060,966 $4.55 $2,831 
Granted in 2021:
Officers and Directors1,345,292 3.83 
Employees1,847,213 4.20 
Exercised(155,690)2.90 
Forfeitures(539,802)4.72 
Outstanding at September 30, 20219,557,979 $4.40 $8,589 
Summary of Restricted Stock Activity Restricted stock activity during the nine months ended September 30, 2021 was as follows:
Number of
restricted
shares		Weighted
average fair
market value
per RSU
Outstanding at January 1, 2021940,759 $3.71 
Granted:
Officers and Directors242,562 3.83 
Employees35,807 3.84 
Vested(484,159)3.84 
Forfeitures— — 
Outstanding at September 30, 2021734,969 $4.08 
Schedule of Earnings Per Share, Basic and Diluted
Three months ended September 30,Nine months ended September 30,
2021202020212020
Basic:
Net income attributable to common stockholders, basic$6,669 $9,383 $20,970 $15,515 
Weighted average common shares outstanding98,699,857 101,031,317 99,485,399 99,377,748 
Basic earnings per common share$0.07 $0.09 $0.21 $0.16 
Diluted:
Effect of dilutive securities:
Net income attributable to common stockholders, diluted$6,669 $9,383 $20,970 $15,515 
Weighted average common shares outstanding98,699,857 101,031,317 99,485,399 99,377,748 
Effect of dilutive options and warrants3,731,026 4,752,251 3,988,568 5,458,745 
Dilutive weighted average common shares outstanding102,430,883 105,783,568 103,473,967 104,836,493 
Diluted earnings per common share$0.07$0.09$0.20$0.15