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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data (Unaudited) [Abstract]  
Quarterly Financial Data (Unaudited)
 (12)
Quarterly Financial Data (Unaudited)
 
Set forth below is selected quarterly financial data for each of the quarters in the years ended December 31, 2012 and 2011.

2012 Quarters Ended
 (in thousands except per share amounts)
March 31
June 30
September 30
December 31
Operating loss
$
(14,554
)
$
(15,316
)
$
(12,175
)
$
(11,825
)
Change in fair value of warranty liability, net
(338
)
917
446
1,134
Net loss
(14,889
)
(14,512
)
(11,813
)
(10,657
)
Basic and diluted loss per share
(0.31
)
(0.26
)
(0.18
)
(0.14
)

2011 Quarters Ended
 (in thousands except per share amounts)
March 31
June 30
September 30
December 31
Operating loss
$
(7,814
)
$
(10,486
)
$
(12,181
)
$
(15,974
)
Change in fair value of warranty liability, net
5,966
5,027
3,872
702
Net loss
(1,848
)
(5,459
)
(8,309
)
(15,268
)
Basic and diluted loss per share
(0.04
)
(0.13
)
(0.18
)
(0.32
)