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Stockholders' Equity and Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity: 

 

 

 

Stock Options

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

Average

 

 

 

Shares

 

 

Exercise Price

 

Outstanding at January 1, 2020

 

 

3,126,521

 

 

$

11.61

 

Granted

 

 

—

 

 

$

—

 

Exercised

 

 

(40,000

)

 

$

2.07

 

Cancelled

 

 

(7,604

)

 

$

13.07

 

Expired

 

 

(176,660

)

 

$

24.11

 

Outstanding at June 30, 2020

 

 

2,902,257

 

 

$

10.98

 

Exercisable at June 30, 2020

 

 

2,724,687

 

 

$

10.84

 
Summary of Activity Related To Time-based Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs)

The following table summarizes the Company’s activity related to time-based restricted stock units (“RSUs”) and performance-based restricted stock units (“PSUs”):

 

 

 

RSUs

 

 

PSUs

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

Average Grant

 

 

 

 

 

 

Average Grant

 

 

 

Shares

 

 

Date Fair Value

 

 

Shares (1)

 

 

Date Fair Value

 

Outstanding at January 1, 2020

 

 

661,258

 

 

$

16.44

 

 

 

376,328

 

 

$

20.65

 

Granted

 

 

624,415

 

 

$

9.65

 

 

 

404,880

 

 

$

8.86

 

Vested

 

 

(252,268

)

 

$

17.06

 

 

 

(5,254

)

 

$

28.72

 

Cancelled

 

 

(27,557

)

 

$

17.37

 

 

 

(32,235

)

 

$

28.72

 

Outstanding at June 30, 2020

 

 

1,005,848

 

 

$

12.04

 

 

 

743,719

 

 

$

13.82

 

 

 

(1)

The number of shares for 62,791 of the PSUs included in the outstanding balance at January 1, 2020 represents the actual number of PSUs granted to each recipient that are eligible to vest if the Company meets its performance goals for the applicable period. The number of shares for the remainder of the PSUs included in the outstanding balance at January 1, 2020 and for all of the PSUs granted in 2020 represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest for those PSUs will vary depending on whether or not the Company meets or exceeds the applicable threshold, target, or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs eligible to vest at “maximum” performance levels.