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Condensed Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Condensed Quarterly Financial Data
The operating results for any quarter are not necessarily indicative of results for any future period.
 
Three months ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
(in thousands, except per share data)
2018
 
 
 
 
 
 
 
Total revenue
$
23,085

 
$
24,999

 
$
28,616

 
$
30,032

Product and service gross profit
$
10,350

 
$
11,832

 
$
12,162

 
$
12,848

Net loss
$
(19,202
)
 
$
(20,601
)
 
$
(16,486
)
 
$
(21,111
)
Net loss per share – basic and diluted
$
(0.75
)
 
$
(0.80
)
 
$
(0.56
)
 
$
(0.68
)
2017
 
 
 
 
 
 
 
Total revenue
$
18,063

 
$
34,592

 
$
27,016

 
$
35,234

Product and service gross profit
$
8,602

 
$
10,086

 
$
9,610

 
$
11,832

Net loss
$
(18,852
)
 
$
(4,555
)
 
$
(11,404
)
 
$
(8,751
)
Net loss per share – basic and diluted
$
(0.87
)
 
$
(0.20
)
 
$
(0.45
)
 
$
(0.34
)