SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Revenues	$ 50,131	$ 24,876	$ 25,352	$ 25,143	$ 23,969	$ 24,316	$ 26,836	$ 26,847	$ 125,502	$ 101,968
Gross margin	14,226	7,238	7,535	7,523	6,753	7,099	8,151	7,637	36,522	29,640
Net income	$ 1,341	$ 833	$ 819	$ 960	$ 1,101	$ 1,321	$ 1,817	$ 1,158	$ 3,953	$ 5,397
Basic income per share (in dollars per share)	$ 0.15	$ 0.09	$ 0.09	$ 0.11	$ 0.13	$ 0.15	$ 0.21	$ 0.14	$ 0.45	$ 0.63
Diluted income per share (in dollars per share)	$ 0.15	$ 0.09	$ 0.09	$ 0.11	$ 0.13	$ 0.15	$ 0.21	$ 0.14	$ 0.45	$ 0.63