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Quarterly Financial Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
Financial information for interim periods was as follows:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
(in thousands, except per share amounts)
2012
 
 
 
 
 
 
 
Product sales
$
17,083

 
$
21,041

 
$
24,529

 
$
28,024

Service sales
9,645

 
10,978

 
14,293

 
11,519

Gross profit
9,943

 
12,451

 
15,490

 
17,090

Net (loss) income
$
(1,375
)
 
$
453

 
$
1,745

 
$
2,757

Net (loss) income per share (a):
 
 
 
 
 
 
 
Basic
$
(0.09
)
 
$
0.03

 
$
0.12

 
$
0.19

Diluted
$
(0.09
)
 
$
0.03

 
$
0.12

 
$
0.18

2011
 
 
 
 
 
 
 
Product sales
$
18,884

 
$
24,331

 
$
17,987

 
$
23,933

Service sales
5,525

 
6,241

 
7,634

 
8,000

Gross profit
9,078

 
11,995

 
10,412

 
13,481

Net (loss) income
(1,534
)
 
190

 
600

 
1,604

Net (loss) income per share (a):
 
 
 
 
 
 
 
Basic
$
(0.10
)
 
$
0.01

 
$
0.04

 
$
0.11

Diluted
$
(0.10
)
 
$
0.01

 
$
0.04

 
$
0.11

 
(a)
Net (loss) income per share is computed independently for each of the quarters. Therefore, the net (loss) income per share for the four quarters may not equal the annual net income (loss) per share data.