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Quarterly Financial Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
 
 
 
 
 
 
 
Product sales
$
15,386

 
$
17,946

 
$
15,622

 
$
27,259

Service sales
25,919

 
26,909

 
28,833

 
26,760

Gross profit
17,560

 
19,145

 
19,726

 
25,983

Net (loss) income
$
(1,422
)
 
$
37

 
$
(463
)
 
$
4,101

Net (loss) income per share (a):
 
 
 
 
 
 
 
Basic
$
(0.09
)
 
$
0.00

 
$
(0.03
)
 
$
0.26

Diluted
$
(0.09
)
 
$
0.00

 
$
(0.03
)
 
$
0.26

2014
 
 
 
 
 
 
 
Product sales
$
18,007

 
$
20,998

 
$
16,862

 
$
25,276

Service sales
18,978

 
19,924

 
27,388

 
25,158

Gross profit
14,593

 
17,485

 
18,802

 
22,567

Net (loss) income
$
(1,123
)
 
$
55

 
$
151

 
$
958

Net (loss) income per share (a):
 
 
 
 
 
 
 
Basic
$
(0.07
)
 
$
0.00

 
$
0.01

 
$
0.06

Diluted
$
(0.07
)
 
$
0.00

 
$
0.01

 
$
0.06

 
(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 (loss) income per share data.