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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Schedule of selected quarterly financial data (unaudited)
The results of operations for any quarter are not necessarily indicative of the results to be expected for any future period (in thousands of dollars, except for share and per share data):

Quarter Ended
March 31
 
June 30
 
September 30
 
December 31
2016:
 

 
 

 
 

 
 

Revenue
$
13,550

 
$
14,675

 
$
18,603

 
$
18,257

Net loss
(10,075
)
 
(11,243
)
 
(5,637
)
 
(4,403
)
Net loss per common share, basic and diluted
(0.36
)
 
(0.40
)
 
(0.20
)
 
(0.14
)
Shares used to compute net loss per common share, basic and diluted
27,817,993

 
27,859,918

 
27,916,819

 
31,705,603

2015:
 

 
 

 
 

 
 

Revenue
$
11,218

 
$
11,908

 
$
12,335

 
$
14,042

Net loss
(7,610
)
 
(9,136
)
 
(8,945
)
 
(8,013
)
Net loss per common share, basic and diluted
(0.34
)
 
(0.35
)
 
(0.32
)
 
(0.29
)
Shares used to compute net loss per common share, basic and diluted
22,539,723

 
26,048,934

 
27,640,806

 
27,672,806