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Supplemental Data Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
QUARTERLY FINANCIAL INFORMATION
(in thousands, except per share data)
Unaudited
For the quarters ending:
 
12/31/2016
9/30/2016
6/30/2016
3/31/2016
12/31/2015
9/30/2015
6/30/2015
3/31/2015
Revenue
$
39

$
24

$
20

$
163

$
22

$
92

$
19

$
14

Net loss
(16,135
)
(17,299
)
(17,866
)
(15,074
)
(13,163
)
(11,186
)
(12,252
)
(8,897
)
Basic and diluted net loss per share
(0.31
)
(0.34
)
(0.35
)
(0.29
)
(0.29
)
(0.25
)
(0.27
)
(0.20
)