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Stock-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period
A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows:
 
 
 
December 31, 2018
 
 
 
Unrecognized Stock-
Based
Compensation
 
 
Average
Remaining
Vesting Period
 
Employees and directors
 
$
12,139
 
 
 
1.41
 
Summary of Option Activity
A summary of option activity is as follows:
 
 
 
Options
 
 
Weighted-Average
Exercise Price
 
Outstanding January 1, 2016
 
 
1,544,597
 
 
$
2.62
 
Granted
 
 
—
 
 
 
—
 
Forfeitures/expirations
 
 
—
 
 
 
—
 
Exercised
 
 
(176,350
)
 
 
1.11
 
Outstanding at December 31, 2016
 
 
1,368,247
 
 
$
2.82
 
Granted
 
 
—
 
 
 
—
 
Forfeitures/expirations
 
 
—
 
 
 
—
 
Exercised
 
 
(209,419
)
 
 
3.17
 
Outstanding at December 31, 2017
 
 
1,158,828
 
 
$
2.75
 
Granted
 
 
—
 
 
 
—
 
Forfeitures/expirations
 
 
—
 
 
 
—
 
Exercised
 
 
(588,291
)
 
 
1.19
 
Outstanding at December 31, 2018
(1)
 
 
570,537
 
 
$
4.36
 
 
 
(1)
 
Expire on dates ranging from January 25, 2019 to November 15, 2021. 
Summary of Information on Stock Options Outstanding
The following table summarizes information on stock options outstanding and exercisable at December 31, 2018:
 
 
 
Options Outstanding and Exercisable
 
Range of Exercise Prices
 
Shares
 
 
Weighted-
Average
Remaining
Life
(Years)
 
 
Weighted-
Average
Exercise
Price
 
$ 0.70 
 
 
20,000
 
 
 
0.1
 
 
$
0.70
 
$2.25 – $2.26  
 
 
180,000
 
 
 
1.1
 
 
 
2.25
 
 $5.05 
 
 
250,000
 
 
 
2.1
 
 
 
5.05
 
$6.36 – $6.82  
 
 
73,037
 
 
 
2.4
 
 
 
6.45
 
$7.01 – $8.51  
 
 
47,500
 
 
 
2.8
 
 
 
7.07
 
 
 
 
570,537
 
 
 
1.8
 
 
$
4.36
 
Summary of Restricted Stock Activity
A summary of restricted stock activity is as follows:
 
 
 
Restricted Stock Awards
 
 
Restricted Stock Units
 
 
 
Shares
 
 
Weighted
Average
Grant Date
Fair Value
 
 
Shares
 
 
Weighted
Average
Grant Date
Fair Value
 
Unvested Balance at January 1, 2016
 
 
1,620,726
 
 
$
16.32
 
 
 
—
 
 
$
—
 
Granted
 
 
1,687,553
 
 
 
11.19
 
 
 
—
 
 
 
—
 
Vested
 
 
(846,386
)
 
 
13.98
 
 
 
—
 
 
 
—
 
Forfeited
 
 
(25,439
)
 
 
16.17
 
 
 
—
 
 
 
—
 
Unvested Balance at December 31, 2016
 
 
2,436,454
 
 
$
13.58
 
 
 
—
 
 
$
—
 
Granted
 
 
1,068,550
 
 
 
10.51
 
 
 
7,231
 
 
 
10.49
 
Vested
 
 
(1,641,870
)
 
 
13.64
 
 
 
—
 
 
 
—
 
Forfeited
 
 
(46,468
)
 
 
12.36
 
 
 
(1,553
)
 
 
10.83
 
Unvested Balance at December 31, 2017
 
 
1,816,666
 
 
$
11.75
 
 
 
5,678
 
 
$
10.40
 
Granted
 
 
903,231
 
 
 
11.77
 
 
 
7,152
 
 
 
12.21
 
Vested
 
 
(618,516
)
 
 
12.67
 
 
 
(1,890
)
 
 
10.40
 
Forfeited
 
 
(144,279
)
 
 
11.83
 
 
 
(1,446
)
 
 
11.97
 
Unvested Balance at December 31, 2018
 
 
1,957,102
 
 
$
11.47
 
 
 
9,494
 
 
$
11.52