Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Tables)

v3.20.4
Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The fair value of each stock option award granted during the years ended December 31, 2020, 2019 and 2018 was estimated as of the grant date using a trinomial lattice model with the following weighted average assumptions:
 
  2020 2019 2018
Expected term (in years)
3.8 – 5.5
3.0 – 5.5
1.6 – 4.0
Risk-free interest rate (%) 0.7  % 2.4  % 2.5  %
Expected volatility (%) 42.7  % 43.2  % 43.0  %
Dividend yield (%) % % %
Weighted average fair value/share at grant date $ 8.88  $ 5.77  $ 2.80 
Share-based Compensation, Stock Options, Activity
The status of the stock options are summarized as follows: 

 
Number
of
Shares
Weighted
Average
Exercise
Price
Outstanding at December 31, 2017 6,342,526  $ 6.51 
     Granted 2,457,102  9.03 
     Exercised (1,570,211) 5.48 
     Forfeited (390,000) 7.15 
Outstanding at December 31, 2018 6,839,417  7.63 
     Granted 969,720  19.70 
     Exercised (2,309,451) 6.83 
     Forfeited (180,927) 13.34 
Outstanding at December 31, 2019 5,318,759  9.97 
     Granted 845,120  28.33 
     Exercised (2,310,934) 7.96 
     Forfeited (67,004) 16.37 
Outstanding at December 31, 2020 3,785,941  15.21 
Exercisable at December 31, 2020 1,622,132  9.53 
Schedule of Nonvested Share Activity
The number and weighted average grant-date fair values of options non-vested at the beginning and end of 2020, as well as options granted, vested and forfeited during the year was as follows:

 
Number of
Options
Weighted
Average
Grant Date
Fair Value
Non-vested at December 31, 2019 3,056,759  $ 3.60 
     Granted 845,120  8.88 
     Vested (1,672,739) 3.27 
     Forfeited (65,331) 5.14 
Non-vested at December 31, 2020 2,163,809  6.07 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable
The following table summarizes information about the options outstanding at December 31, 2020:
 
  Options Outstanding Options Exercisable
Range of
Exercise
Prices ($)
Number
Outstanding
Weighted
Average
Remaining
Contractual
Life (Years)
Weighted
Average
Exercise
Price
Number
Exercisable
Weighted
Average
Remaining
Contractual
Life (Years)
Weighted
Average
Exercise
Price
6.00 – 8.00
493,176  0.92 $ 7.26  480,676  0.91 $ 7.25 
8.01 – 9.00
1,206,864  1.99 8.05  703,360  1.88 8.06 
9.01 – 15.00
498,606  2.48 10.97  271,253  2.39 10.66 
15.01 – 20.00
507,845  3.28 19.56  97,441  3.26 19.58 
20.01 – 37.53
1,079,450  6.04 26.75  69,402  5.39 21.75 
  3,785,941  3.24 15.21  1,622,132  1.91 9.53 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The number and weighted average grant date fair values of restricted non-vested common stock at the beginning and end of 2020, 2019 and 2018, as well as stock awards granted, vested and forfeited during the year are as follows:
Number
of
Restricted
Shares
Weighted
Average
Grant Date
Fair Value
Nonvested at December 31, 2017 327,211  $ 7.27 
Granted in 2018 87,811  12.87 
Vested in 2018 (119,180) 7.27 
Forfeited in 2018 (13,334) 7.27 
Nonvested at December 31, 2018 282,508  9.01 
Granted in 2019 230,980  19.93 
Vested in 2019 (115,711) 9.36 
Forfeited in 2019 (62,479) 12.53 
Nonvested at December 31, 2019 335,298  15.75 
Granted in 2020 149,012  28.45 
Vested in 2020 (184,127) 12.90 
Forfeited in 2020 (8,292) 20.75 
Nonvested at December 31, 2020 291,891  23.82