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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2021 follows:
Expected price volatility
58.57%-59.87%
Risk-free interest rate
0.50%-1.13%
Weighted average expected life in years6 years
Dividend yield— 
Summary of Stock Option Activity Option activity during the six months ended June 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 Directors1,249,292 3.84 
Employees1,644,390 4.25 
Exercised(42,447)2.35 
Forfeitures(295,071)4.79 
Outstanding at June 30, 20219,617,130 $4.41 $1,061 
Summary of Restricted Stock Activity Restricted stock activity during the six months ended June 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 Directors226,562 3.84 
Employees35,807 3.84 
Vested(334,842)3.88 
Forfeitures— — 
Outstanding at June 30, 2021868,286 $3.87 
Schedule of Earnings Per Share, Basic and Diluted
Three months ended June 30,Six months ended June 30,
2021202020212020
Basic:
Net income attributable to common stockholders, basic$9,064 $1,165 $14,301 $6,131 
Weighted average common shares outstanding98,793,242 100,136,893 99,884,680 98,541,877 
Basic earnings per common share$0.09 $0.01 $0.14 $0.06 
Diluted:
Effect of dilutive securities:
Net income attributable to common stockholders, diluted$9,064 $1,165 $14,301 $6,131 
Weighted average common shares outstanding98,793,242 100,136,893 99,884,680 98,541,877 
Effect of dilutive options and warrants3,715,270 7,974,308 4,124,730 8,520,284 
Dilutive weighted average common shares outstanding102,508,512 108,111,201 104,009,410 107,062,161 
Diluted earnings per common share$0.09$0.01$0.14$0.06