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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
 
 
 
Quarter Ended
  
 
March 31,
2014
 
June 30,
2014
 
September 30,
2014
 
December 31,
2014
Loss from operations
 
$
(3,839
) 
 
$
(4,651
) 
 
$
(4,911
) 
 
$
(7,101
) 
Net loss
 
$
(3,838
) 
 
$
(4,556
) 
 
$
(4,910
) 
 
$
(6,480
) 
Net loss per share – basic and dilutive
 
$
(0.07
) 
 
$
(0.08
) 
 
$
(0.08
) 
 
$
(0.10
) 
Weighted average common share – basic and dilutive
 
 
58,324,260
 
 
 
58,543,528
 
 
 
58,543,528
 
 
 
65,483,336
 
 
 
 
 
 
 
Quarter Ended
  
 
March 31,
2013
 
June 30,
2013
 
September 30,
2013
 
December 31,
2013
Loss from operations
 
$
(2,240
) 
 
$
(2,461
) 
 
$
(3,365
) 
 
$
(4,273
) 
Net loss
 
$
(2,228
) 
 
$
(2,497
) 
 
$
(3,368
) 
 
$
(4,225
) 
Net loss per share – basic and dilutive
 
$
(0.05
) 
 
$
(0.06
) 
 
$
(0.08
) 
 
$
(0.08
) 
Weighted average common share – basic and dilutive
 
 
44,601,396
 
 
 
44,654,414
 
 
 
44,654,414
 
 
 
46,690,621