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Summarized Quarterly Financial Information - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Summarized quarterly financial information is as follows (amounts in thousands except per share data):
 
Quarter Ended
 
March 31
June 30
September 30
December 31
2018
 
 
 
 
Revenues
$
24,917

$
21,507

$
20,886

$
19,789

Income (loss) from operations
(821
)
(1,326
)
(3,657
)
701

Loss available to common stockholders
(2,212
)
(2,611
)
(4,979
)
$
(4,117
)
Loss per share:
 
 
 
 
Basic
$
(0.09
)
$
(0.10
)
$
(0.19
)
$
(0.16
)
Diluted
$
(0.09
)
$
(0.10
)
$
(0.19
)
$
(0.16
)
 
 
 
 
 
2017
 
 
 
 
Revenues
$
20,772

$
24,251

$
28,184

$
35,080

Income (loss) from operations
(3,633
)
(2,289
)
(1,885
)
221

Loss available to common stockholders
(4,918
)
(3,385
)
(3,085
)
(389
)
Loss per share:
 
 
 
 
Basic
$
(0.23
)
$
(0.16
)
$
(0.15
)
$
(0.02
)
Diluted
$
(0.23
)
$
(0.16
)
$
(0.15
)
$
(0.02
)