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Selected Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2012
Selected Quarterly Financial Data [Abstract]  
Selected Quarterly Financial Data
Selected Quarterly Financial Data
 
The table below sets forth certain unaudited statements of comprehensive loss data, and net loss per common share data, for each quarter of 2012 and 2011:
 
(in thousands, except per share data)
 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
 
 
 
(Unaudited)
 
 
2012
 

 
 

 
 

 
 

Revenues
$
300

 
$
199

 
$
372

 
218

Loss from operations
$
(29,383
)
 
$
(25,480
)
 
$
(29,060
)
 
(24,492
)
Consolidated net loss
$
(29,868
)
 
$
(25,931
)
 
$
(29,539
)
 
(24,873
)
Consolidated net loss per common share, basic and diluted
$
(0.06
)
 
$
(0.05
)
 
$
(0.06
)
 
$
(0.05
)
Shares used in computing consolidated net loss per common share
480,324

 
480,634

 
490,049

 
507,619

2011
 
 
 
 
 
 
 
Revenues
$
596

 
$
555

 
$
355

 
$
343

Loss from operations
$
(29,136
)
 
$
(25,926
)
 
$
(25,691
)
 
$
(33,342
)
Consolidated net loss
$
(29,629
)
 
$
(26,638
)
 
$
(26,103
)
 
$
(33,845
)
Consolidated net loss per common share, basic and diluted
$
(0.09
)
 
$
(0.08
)
 
$
(0.08
)
 
$
(0.10
)
Shares used in computing consolidated net loss per common share
337,527

 
337,668

 
337,678

 
350,069