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Quarterly Financial Results
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Results
Quarterly Results of Operations (unaudited)
Three Months Ended:
Revenue
 
Cost of goods sold
 
Operating expenses
 
Net income (loss)
 
Basic income (loss) per share
 
Diluted income (loss) per share
December 31, 2011
$
23,392

 
$
5,394

 
$
21,262

 
$
(3,665
)
 
$
(0.06
)
 
$
(0.06
)
September 30, 2011
22,302

 
4,829

 
22,622

 
(5,149
)
 
(0.12
)
 
(0.12
)
June 30, 2011
19,175

 
4,150

 
20,202

 
(5,177
)
 
(0.24
)
 
(0.24
)
March 31, 2011
18,548

 
4,373

 
19,000

 
(4,825
)
 
(0.09
)
 
(0.09
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2010
$
19,243

 
$
4,236

 
$
18,315

 
$
11,724

 
$
0.23

 
$
0.22

September 30, 2010
17,874

 
3,822

 
14,578

 
(466
)
 
(0.01
)
 
(0.01
)
June 30, 2010
15,654

 
3,612

 
12,229

 
(380
)
 
(0.01
)
 
(0.01
)
March 31, 2010
14,480

 
3,361

 
11,323

 
(225
)
 
(0.00)

 
(0.00)