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Quarterly Financial Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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)
2016
 
 
 
 
 
 
 
Product sales
$
15,382

 
$
20,062

 
$
19,020

 
$
18,611

Service sales
24,998

 
25,904

 
26,826

 
25,319

Cost of product sales
10,670

 
12,989

 
11,001

 
11,674

Cost of service sales
12,991

 
13,259

 
13,576

 
13,140

Operating expenses
20,093

 
20,411

 
18,256

 
19,384

(Loss) income from operations
(3,374
)
 
(693
)
 
3,013

 
(268
)
Net (loss) income
$
(2,791
)
 
$
(806
)
 
$
2,863

 
$
(6,783
)
Net (loss) income per share (a):
 
 
 
 
 
 
 
Basic
$
(0.18
)
 
$
(0.05
)
 
$
0.18

 
$
(0.43
)
Diluted
$
(0.18
)
 
$
(0.05
)
 
$
0.18

 
$
(0.43
)
2015
 
 
 
 
 
 
 
Product sales
$
15,386

 
$
17,946

 
$
15,622

 
$
27,259

Service sales
25,919

 
26,909

 
28,833

 
26,760

Cost of product sales
10,485

 
12,017

 
10,275

 
14,627

Cost of service sales
13,260

 
13,693

 
14,454

 
13,409

Operating expenses
19,468

 
19,403

 
19,520

 
20,815

(Loss) income from operations
(1,908
)
 
(258
)
 
206

 
5,168

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

 
(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.