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Condensed Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
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)
2019
 
 
 
 
 
 
 
Total revenue
$
27,688

 
$
30,345

 
$
30,604

 
$
36,931

Product and service gross profit
$
12,641

 
$
12,765

 
$
15,424

 
$
18,845

Net income (loss)
$
(21,898
)
 
$
(20,037
)
 
$
(22,748
)
 
$
23,987

Net income (loss) per share – basic
$
(0.69
)
 
$
(0.57
)
 
$
(0.64
)
 
$
0.67

Net income (loss) per share – diluted
$
(0.69
)
 
$
(0.57
)
 
$
(0.64
)
 
$
0.61

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
)