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Quarterly Financial Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
 
 
 
 
 
 
Product sales
$
14,863

 
$
14,323

 
$
14,169

 
$
13,613

Service sales
25,348

 
26,126

 
26,281

 
25,365

Cost of product sales
10,539

 
9,295

 
9,578

 
8,062

Cost of service sales
13,268

 
13,094

 
13,374

 
12,956

Operating expenses
20,874

 
19,428

 
19,299

 
19,085

Loss from operations
(4,470
)
 
(1,368
)
 
(1,801
)
 
(1,125
)
Net loss
$
(4,885
)
 
$
(2,026
)
 
$
(2,438
)
 
$
(1,685
)
Net loss per share (a):
 
 
 
 
 
 
 
Basic
$
(0.30
)
 
$
(0.12
)
 
$
(0.15
)
 
$
(0.10
)
Diluted
$
(0.30
)
 
$
(0.12
)
 
$
(0.15
)
 
$
(0.10
)
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
)
 
(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.