Equity Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Fair Value of Each Stock Option Granted Weighted-Average Assumptions

The fair value of each stock option granted was estimated using the following weighted-average assumptions:

 

 

 

Year Ended

 

 

Year Ended

 

 

 

December 31,

 

 

December 31,

 

 

 

2015

 

 

2014

 

Fair value of options granted

 

$

4.10

 

 

$

3.26

 

Expected volatility

 

 

84

%

 

 

117

%

Risk-free interest rate

 

 

1.6

%

 

 

2.0

%

Expected lives

 

 

6.0 years

 

 

 

6.1 years

  

Dividend rate

 

 

1.6%

 

 

 

2.3%

  

 
Summary of Stock Option Activity

The following is a summary of stock option activity: (in thousands, except exercise price data and contractual life data):

 

Options

 

Number of Shares

 

 

Weighted-Average Exercise Price

 

 

Weighted-Average Remaining Contractual Life (Years)

 

 

Aggregate Intrinsic Value

 

Outstanding at December 31, 2013

 

 

7,717

 

 

$

4.05

 

 

 

 

 

 

 

 

 

Granted

 

 

350

 

 

$

4.40

 

 

 

 

 

 

 

 

 

Exercised

 

 

(1,042

)

 

 

1.77

 

 

 

 

 

 

$

5,036

 

Forfeited or cancelled

 

 

(1,470

)

 

 

8.53

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2014

 

 

5,555

 

 

$

3.33

 

 

 

 

 

 

$

19,015

 

Granted

 

 

75

 

 

$

6.45

 

 

 

 

 

 

 

 

 

Exercised

 

 

(966

)

 

 

2.23

 

 

 

 

 

 

$

4,954

 

Forfeited or cancelled

 

 

(1,241

)

 

 

7.07

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2015

 

 

3,423

 

 

$

2.35

 

 

 

 

 

 

$

18,341

 

Exercised

 

 

(925

)

 

 

2.36

 

 

 

 

 

 

$

4,278

 

Forfeited or cancelled

 

 

(165

)

 

 

3.61

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2016

 

 

2,333

 

 

$

2.26

 

 

 

5.69

 

 

$

11,061

 

Vested and Exercisable at December 31, 2016

 

 

1,717

 

 

$

2.09

 

 

 

5.37

 

 

$

8,440

 

Vested and Expected to Vest at December 31, 2016

 

 

2,004

 

 

$

2.25

 

 

 

6.02

 

 

$

9,527

 

 
Summary of Nonvested Restricted Stock and Restricted Stock Units Activity

The following is a summary of nonvested restricted stock and restricted stock units activity: (in thousands, except grant date fair value data):

 

 

 

Number of Shares

 

 

Weighted-Average Grant Date Fair Value

 

Nonvested balance at December 31, 2013

 

 

494

 

 

$

2.73

 

Granted

 

 

1,181

 

 

 

4.51

 

Vested

 

 

(489

)

 

 

3.38

 

Forfeited or cancelled

 

 

(17

)

 

 

2.53

 

Nonvested balance at December 31, 2014

 

 

1,169

 

 

$

4.15

 

Granted

 

 

764

 

 

 

8.25

 

Vested

 

 

(614

)

 

 

4.91

 

Forfeited or cancelled

 

 

(51

)

 

 

4.52

 

Nonvested balance at December 31, 2015

 

 

1,268

 

 

$

6.39

 

Granted

 

 

931

 

 

 

6.78

 

Vested

 

 

(685

)

 

 

6.28

 

Forfeited or cancelled

 

 

(134

)

 

 

6.25

 

Nonvested balance at December 31, 2016

 

 

1,380

 

 

$

6.73