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Quarterly Financial Results (unaudited)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
Quarterly Results of Operations (Unaudited)
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended:
Revenue

Cost of goods sold

Operating expenses

Net loss

Basic loss per share

Diluted loss per share
December 31, 2012 (a)
$
29,222

 
$
7,158

 
$
27,761

 
$
(6,518
)
 
$
(0.10
)
 
$
(0.10
)
September 30, 2012
26,696


6,444


27,185


(5,857
)

(0.10
)

(0.10
)
June 30, 2012
25,509


6,277


24,819


(6,696
)

(0.11
)

(0.11
)
March 31, 2012
24,519


5,403


22,790


(16,703
)

(0.29
)

(0.29
)
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended:











December 31, 2011
$
23,392


$
5,394


$
21,262


$
(3,665
)

$
(0.06
)

$
(0.06
)
September 30, 2011
22,302


4,829


22,622


(6,603
)

(0.12
)

(0.12
)
June 30, 2011
19,175


4,150


20,202


(13,666
)

(0.24
)

(0.24
)
March 31, 2011
18,548


4,373


19,000


(4,795
)

(0.09
)

(0.09
)


(a) Includes $0.6 million of operating expenses which was recorded to the Consolidated Statements of Operations for the three months ended December 31, 2012. This amount represents a cumulative correction of prior period errors which relate to the recognition of stock-based compensation, though is not material to any previously reported prior period.