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Selected Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
The following amounts are in thousands, except per share amounts:
 
Quarter Ended
 
March 31,
2017
 
June 30,
2017
 
September 30,
2017
 
December 31,
2017
 
(unaudited)
Total revenues
$
5,465

 
$
729

 
$
516

 
$
485

Net loss
$
(12,620
)
 
$
(13,846
)
 
$
(13,416
)
 
$
(11,980
)
Basic and diluted net loss per share
$
(0.50
)
 
$
(0.54
)
 
$
(0.52
)
 
$
(0.29
)

 
Quarter Ended
 
March 31,
2016
 
June 30,
2016
 
September 30,
2016
 
December 31,
2016
 
(unaudited)
Total revenues
$
1,863

 
$
1,133

 
$
8,206

 
$
2,058

Net loss
$
(12,294
)
 
$
(14,347
)
 
$
(12,443
)
 
$
(14,446
)
Basic and diluted net loss per share
$
(0.61
)
 
$
(0.71
)
 
$
(0.60
)
 
$
(0.57
)