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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION – Impact of Adoption of Topic 606 on Condensed Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
May 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Common stock dividend declared, percentage of shares outstanding 5.00%        
Operating revenues   $ 36,158 $ 31,640 $ 86,038 $ 74,006
Operating costs:          
Operating expenses   31,215 32,798 69,974 72,772
Loss from operations   (6,291) (15,504) (7,931) (27,643)
Net loss   $ (5,711) $ (14,928) $ (7,420) $ (24,080)
Basic and diluted loss per share of common stock     $ (0.66)   $ (1.06)
Weighted average equivalent common shares outstanding - assuming dilution   22,897,686 22,766,894 22,888,746 22,754,772
ASU 2014-09 | As Previously Reported          
Operating revenues     $ 30,469   $ 72,396
Operating costs:          
Operating expenses     31,508   71,045
Loss from operations     (15,385)   (27,526)
Net loss     $ (14,809)   $ (23,963)
Basic and diluted loss per share of common stock     $ (0.68)   $ (1.11)
Weighted average equivalent common shares outstanding - assuming dilution     21,682,757   21,671,212
ASU 2014-09 | Adjustments          
Operating revenues     $ 1,171   $ 1,610
Operating costs:          
Operating expenses     1,290   1,727
Loss from operations     (119)   (117)
Net loss     $ (119)   $ (117)
Stock Dividend Adjustments          
Operating costs:          
Basic and diluted loss per share of common stock     $ 0.02   $ 0.05
Weighted average equivalent common shares outstanding - assuming dilution     1,084,137   1,083,560