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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

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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