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Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
Quarters Ended
 
December 31
 
September 30
 
June 30
 
March 31
2015:
 
 
 
 
 
 
 
Total revenue
$
11,328

 
$
11,152

 
$
10,555

 
$
11,079

Net loss
$
(3,830
)
 
$
(3,076
)
 
$
(4,029
)
 
$
(3,329
)
Net loss attributable to common stockholders
$
(1,056
)
 
$
(891
)
 
$
(1,100
)
 
$
(947
)
Net loss per common share - basic and diluted
$
(0.26
)
 
$
(0.23
)
 
$
(0.28
)
 
$
(0.24
)
Weighted average number of common shares outstanding - basic and diluted
3,941,242

 
3,941,242

 
3,941,242

 
3,941,242

 
 
 
 
 
 
 
 
2014:
 
 
 
 
 
 
 
Total revenue
$
10,897

 
$
11,438

 
$
10,870

 
$
10,915

Net loss
$
(4,094
)
 
$
(4,435
)
 
$
(5,128
)
 
$
(3,695
)
Net loss attributable to common stockholders
$
(1,114
)
 
$
(1,188
)
 
$
(1,340
)
 
$
(1,027
)
Net loss per common share - basic and diluted
$
(0.28
)
 
$
(0.30
)
 
$
(0.34
)
 
$
(0.26
)
Weighted average number of common shares outstanding - basic and diluted
3,941,242

 
3,941,242

 
3,941,242

 
3,941,242