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Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Summary of consolidated financial results of operations
This table summarizes the unaudited consolidated financial results of operations for the quarters ended:
($ in thousands, except per share data)
March 31,
 
June 30,
 
September 30,
 
December 31,
2015 Quarter Ended
 

 
 

 
 

 
 

Total revenue
$
194

 
$
137

 
$
79

 
$
82

Total cost of revenue
147

 
162

 
204

 
209

Gross loss
47

 
(25
)
 
(125
)
 
(127
)
Operating expenses
6,911

 
7,334

 
6,698

 
16,234

Other income (expense)
(1,661
)
 
603

 
5,302

 
(1,290
)
Net loss
$
(8,525
)
 
$
(6,756
)
 
$
(1,521
)
 
$
(17,651
)
Basic net loss per share
$
(0.21
)
 
$
(0.17
)
 
$
(0.04
)
 
$
(0.40
)
Diluted net loss per share
$
(0.21
)
 
$
(0.17
)
 
$
(0.07
)
 
$
(0.40
)
2014 Quarter Ended
 

 
 

 
 

 
 

Total revenue
$
46

 
$
58

 
$
20

 
$
56

Total cost of revenue
793

 
547

 
512

 
460

Gross loss
(747
)
 
(489
)
 
(492
)
 
(404
)
Operating expenses
10,253

 
6,107

 
5,699

 
5,763

Other income (expense)
(3,009
)
 
4,339

 
179

 
2,795

Net loss
$
(14,009
)
 
$
(2,257
)
 
$
(6,012
)
 
$
(3,372
)
Basic net loss per share
$
(0.35
)
 
$
(0.06
)
 
$
(0.15
)
 
$
(0.08
)
Diluted net loss per share
$
(0.35
)
 
$
(0.09
)
 
$
(0.17
)
 
$
(0.09
)