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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
Net loss per share was computed by dividing net loss by the weighted average number of common shares outstanding for the three and six months ended June 30, 2012 and 2011 as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Net loss
$
(6,696
)
 
$
(13,666
)
 
$
(23,399
)
 
$
(18,461
)
Weighted average shares
58,700

 
56,217

 
58,160

 
56,062

Net loss per share - basic and diluted
$
(0.11
)
 
$
(0.24
)
 
$
(0.40
)
 
$
(0.33
)

The
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following outstanding Company securities were excluded from the above calculations of net loss per share because their impact would have been anti-dilutive due to the net losses during the three and six months ended June 30, 2012 and 2011:
 
Three Months Ended
 June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Common stock options
3,782

 
233

 
3,773

 
264