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Quarterly Results (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results Financial Information

Quarterly results for the years ended December 31, 2017 and 2016 are as follows (in thousands, except per share amounts):

 

     Three months ended  
     March 31,      June 30,      September 30,      December 31,  
     2017      2017      2017      2017  

Revenues

    $ 10,268      $ 10,520      $ 13,815      $ 10,827  

Operating loss

      (684 )       (563 )       (1,193 )       (2,366 ) 

Loss before income tax expense

      (664 )       (535 )       (1,172 )       (2,369 ) 

Net loss

      (664 )       (535 )       (1,201 )       (2,378 ) 

Net income (loss) attributable to common stockholders

      286        387        (1,510 )       (3,225 ) 

Basic income (loss) per share

      0.09        0.12        (0.45 )       (0.98 ) 

Diluted income (loss) per share

      0.08        0.11        (0.45 )       (0.98 ) 
     Three months ended  
     March 31,      June 30,      September 30,      December 31,  
     2016      2016      2016      2016  

Revenues

    $ 9,706      $ 9,978      $ 13,103      $ 8,793  

Operating loss

      (1,271 )       (1,442 )       (854 )       (3,297 ) 

Loss before income tax expense

      (1,263 )       (1,429 )       (756 )       (3,259 ) 

Net loss

      (1,288 )       (1,461 )       (756 )       (3,257 ) 

Net loss attributable to common stockholders

      (1,724 )       (1,995 )       (1,046 )       (4,576 ) 

Basic loss per share

      (0.55 )       (0.60 )       (0.34 )       (1.38 ) 

Diluted loss per share

      (0.55 )       (0.60 )       (0.34 )       (1.38 )