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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of quarterly results
The following is a summary of our quarterly results for the years ended December 31, 2018 and 2017 (in thousands, except for per share data):
 
Quarter
 
Year Ended December 31, 2018
2018
First
 
Second
 
Third
 
Fourth
 
Operating loss
$
(15,757
)
 
$
(14,415
)
 
$
(16,887
)
 
$
(19,663
)
 
$
(66,722
)
Net loss
$
(15,086
)
 
$
(13,618
)
 
$
(15,958
)
 
$
(16,994
)
 
$
(61,656
)
Per common share:
 
 
 
 
 
 
 
 
 
Loss per share, basic
$
(0.63
)
 
$
(0.57
)
 
$
(0.66
)
 
$
(0.64
)
 
$
(2.50
)
Loss per share, diluted
$
(0.63
)
 
$
(0.57
)
 
$
(0.66
)
 
$
(0.64
)
 
$
(2.50
)
 
 
 
 
 
 
 
 
 
 
 
Quarter
 
Year Ended December 31, 2017
2017
First
 
Second
 
Third
 
Fourth
 
Operating loss
$
(9,988
)
 
$
(2,555
)
 
$
(9,087
)
 
$
(7,151
)
 
$
(28,781
)
Net loss
$
(11,435
)
 
$
(2,684
)
 
$
(9,090
)
 
$
(6,861
)
 
$
(30,070
)
Per common share:
 
 
 
 
 
 
 
 
 
Loss per share, basic
$
(0.75
)
 
$
(0.13
)
 
$
(0.45
)
 
$
(0.30
)
 
$
(1.52
)
Loss per share, diluted
$
(0.75
)
 
$
(0.13
)
 
$
(0.45
)
 
$
(0.30
)
 
$
(1.52
)