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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Reserved Shares of Authorized but Unissued Common Stock

As of March 31, 2013, the Company had reserved the following shares of authorized but unissued common stock:

 

 

 

 

 

 

 

  

Common Stock

 

Stock option plans

  

 

5,088,612

  

Stock purchase plan

  

 

257,734

  

Warrants

  

 

4,482

  

 

  

 

5,350,828

  

 

  

 

 

 

 
Summary of Stock Option and Restricted Stock Unit Activity

The following table summarizes the Company’s stock option activity during the three months ended March 31, 2013:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

Stock Options

 

  

Restricted Stock Units

 

 

  

Shares
available for
grant

 

 

Number
of
shares

 

 

Weighted
average
exercise
price

 

  

Number
of
units

 

 

Weighted
average
grant
date fair
value

 

Balance at December 31, 2012

  

 

382,668

  

 

 

2,773,887

  

 

$

5.87

  

  

 

924,823

  

 

$

5.84

  

Authorized for issuance

  

 

1,069,115

  

 

 

-

  

 

 

0.00

  

  

 

-

  

 

 

0.00

  

Granted

  

 

(30,000

) 

 

 

17,800

  

 

 

5.60

  

  

 

12,200

  

 

 

5.74

  

Exercised/Converted

  

 

-

  

 

 

(18,251

) 

 

 

4.32

  

  

 

(51,634

) 

 

 

6.12

  

Forfeited

  

 

58,998

  

 

 

(14,472

) 

 

 

8.43

  

  

 

(36,522

) 

 

 

5.84

  

Balance at March 31, 2013

  

 

1,480,781

  

 

 

2,758,964

  

 

 $

5.86

  

  

 

848,867

  

 

 $

5.82

  

 

  

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 
Summary of Information about Stock Options Outstanding

The following table summarizes information about stock options outstanding as of March 31, 2013:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

Options Outstanding

 

 

  

Number
of
shares

 

  

Weighted
average
exercise price

 

  

Weighted
average
remaining
contractual
term
(years)

 

  

Aggregate
intrinsic value
(in thousands)

 

Vested and expected to vest

  

 

2,700,303

  

  

$

5.87

  

  

 

6.39

  

  

$

1,228

  

Exercisable

  

 

1,902,220

  

  

$

5.67

  

  

 

5.50

  

  

$

1,143

  

 
Summary of Information about Restricted Stock Units Outstanding

The following table summarizes information about restricted stock units outstanding as of March 31, 2013:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

Restricted Stock Units Outstanding

 

 

  

Number
of
shares

 

  

Weighted
average
grant date
fair value

 

  

Weighted
average
remaining
contractual
term
(years)

 

  

Aggregate
intrinsic value
(in thousands)

 

Vested and expected to vest

  

 

782,071

  

  

$

5.82

  

  

 

1.15

  

  

$

3,996

  

 
Summary of Stock Appreciation Unit Activity

The following table summarizes the Company’s stock appreciation unit activity during the three months ended March 31, 2013:

 

 

 

 

 

 

 

 

 

 

 

  

Stock
Appreciation
Units

 

 

Weighted
average
exercise
price

 

Stock appreciation units outstanding as of December 31, 2012

  

 

212,534

  

 

$

7.07

  

Stock appreciation units cancelled

  

 

(4,423

) 

 

 

8.93

  

Stock appreciation units exercised

  

 

(316

) 

 

 

4.25

  

Stock appreciation units outstanding as of March 31, 2013

  

 

207,795

  

 

 $

7.04

  

 

  

 

 

 

 

 

 

 

 
Summary of Information about Stock Appreciation Units Outstanding

The following table summarizes information about stock appreciation units outstanding as of March 31, 2013:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

Stock Appreciation Units Outstanding

 

 

  

Number
of
units

 

  

Weighted
average
exercise price

 

  

Weighted
average
remaining
contractual
term
(years)

 

  

Aggregate
intrinsic value
(in thousands)

 

Vested and expected to vest

  

 

207,396

  

  

$

7.03

  

  

 

5.86

  

  

$

101

  

Exercisable

  

 

181,913

  

  

$

6.71

  

  

 

5.69

  

  

$

98