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Quarterly Financial Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
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)
2013
 
 
 
 
 
 
 
Product sales
$
25,216

 
$
25,886

 
$
20,331

 
$
18,862

Service sales
14,711

 
17,311

 
19,885

 
20,086

Gross profit
15,769

 
18,026

 
16,527

 
15,390

Net income (loss)
$
1,963

 
$
1,549

 
$
1,386

 
$
(365
)
Net income (loss) per share (a):
 
 
 
 
 
 
 
Basic
$
0.13

 
$
0.10

 
$
0.09

 
$
(0.02
)
Diluted
$
0.13

 
$
0.10

 
$
0.09

 
$
(0.02
)
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

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