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Supplementary Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
In thousands, except per share data)
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
Year
2018
 
 
 
 
 
 
 
 
 
 
Revenues
 
$
18,027

 
$
19,011

 
$
22,484

 
$
31,335

 
$
90,857

Gross profit
 
10,361

 
11,284

 
14,346

 
22,706

 
58,697

Profit (loss) from operations
 
(4,322
)
 
(4,246
)
 
(1,336
)
 
5,995

 
(3,909
)
Net (loss) profit
 
(7,659
)
 
(4,651
)
 
(1,069
)
 
5,242

 
(8,137
)
Net (loss) profit per share (Basic)
 
(0.21
)
 
(0.12
)
 
(0.02
)
 
0.12

 
(0.20
)
Net (loss) profit per share (Diluted)
 
(0.21
)
 
(0.12
)
 
(0.02
)
 
0.11

 
(0.20
)
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
 
Revenues
 
$
9,361

 
$
16,953

 
$
14,260

 
$
23,350

 
$
63,924

Gross profit
 
2,252

 
9,283

 
7,074

 
14,961

 
33,570

Loss from operations
 
(9,623
)
 
(2,521
)
 
(4,031
)
 
1,191

 
(14,984
)
Net loss
 
(9,778
)
 
(2,388
)
 
(5,407
)
 
287

 
(17,286
)
Net (loss) profit per share (Basic and Diluted)
 
(0.31
)
 
(0.07
)
 
(0.16
)
 
0.01

 
(0.52
)