Three Months Ended March 31,

2013

2012

(unaudited, in thousands, except
per share amounts)

Numerator:

Net loss available to common stockholders

$

(6,158

)

$

(9,682

)

Denominator:

Weighted average shares outstanding - basic

36,614

35,590

Potential common shares - options (treasury stock method)

—

Weighted average shares outstanding - diluted

36,614

35,590

Shares excluded (anti-dilutive)

70

40

Shares excluded due to an exercise price greater than weighted average stock price for the period

1,473

1,567

Net loss per common share:

Basic

($

0.17

)

($

0.27

)

Diluted

($

0.17

)

($

0.27

)