Annual report pursuant to Section 13 and 15(d)

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details)

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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Summary of the quarterly operating results                      
Revenue $ 44,355 $ 53,467 $ 47,975 $ 43,121 $ 44,329 $ 39,040 $ 57,981 $ 45,632 $ 188,918 $ 186,982  
Gross profit 5,332 10,212 6,747 6,450 7,967 4,760 6,754 (1,555) 28,741 17,926  
Loss from continuing operations $ (2,688) $ (2,840) $ (6,024) $ (2,238) $ (3,178) $ (9,786) $ (5,430) $ (11,625) $ (13,790) $ (30,019)  
Loss per common share from continuing operations:                      
Basic loss per common share (in dollars per share) $ (0.15) $ (0.16) $ (0.33) $ (0.12) $ (0.18) $ (0.55) $ (0.31) $ (0.67) $ (0.76) $ (1.70)  
Diluted loss per common share $ (0.15) $ (0.16) $ (0.33) $ (0.12) $ (0.18) $ (0.55) $ (0.31) $ (0.67) $ (0.76) $ (1.70)  
Liquidated damages                      
Summary of the quarterly operating results                      
Revenue                   $ 4,400  
Reversal of liquidated damages reserve         $ 4,400         4,400  
Loss per common share from continuing operations:                      
Performance liquidated damages         $ 0         $ 0 $ 4,400