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QUARTERLY RESULTS OF OPERATIONS - UNAUDITED - Summary of consolidated statements of comprehensive income (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 3,929 $ 5,899 $ 6,904 $ 4,834 $ 6,946 $ 4,041 $ 4,510 $ 4,123 $ 21,566 $ 19,621 $ 23,720
Operating income 641 2,313 2,074 880 2,625 429 477 384 5,908 3,915 7,089
Net income $ 460 $ 1,573 $ 1,436 $ 635 $ 1,826 $ 2,197 $ 319 $ 272 $ 4,103 $ 4,614 $ 4,583
Net income per share - basic (in dollars per share) $ 0.02 $ 0.07 $ 0.06 $ 0.03 $ 0.08 $ 0.10 $ 0.01 $ 0.01 $ 0.18 $ 0.20 $ 0.20
Net income per share - diluted (in dollars per share) $ 0.02 $ 0.07 $ 0.06 $ 0.03 $ 0.08 $ 0.10 $ 0.01 $ 0.01 $ 0.18 $ 0.20 $ 0.20