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Quarterly Financial Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
 
 
 
 
 
 
Product sales
$
13,992

 
$
16,162

 
$
16,367

 
$
16,756

Service sales
26,109

 
27,230

 
27,150

 
26,995

Cost of product sales
8,923

 
10,094

 
9,767

 
10,726

Cost of service sales
13,816

 
15,498

 
15,376

 
15,900

Operating expenses
20,542

 
18,987

 
19,294

 
19,002

Loss from operations
(3,180
)
 
(1,187
)
 
(920
)
 
(1,877
)
Net loss
$
(3,893
)
 
$
(1,343
)
 
$
(1,174
)
 
$
(1,822
)
Net loss per share (a):
 
 
 
 
 
 
 
Basic
$
(0.23
)
 
$
(0.08
)
 
$
(0.07
)
 
$
(0.11
)
Diluted
$
(0.23
)
 
$
(0.08
)
 
$
(0.07
)
 
$
(0.11
)
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
)
 
(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.