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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, 2016
Quarterly Financial Data [Abstract]
Total revenue	$ 16,160	$ 16,396	$ 18,204	$ 14,718	$ 16,660	$ 15,913	$ 16,218	$ 18,902	$ 65,478	$ 67,693	$ 71,654
Operating income (loss)	106	(44)	226	350	217	593	414	343	638	1,567	8,430
Net income (loss)	$ (282)	$ 236	$ 247	$ 225	$ 18,702	$ 522	$ 375	$ 252	$ 426	$ 19,851	$ 6,469
Net income (loss) per share - Basic (in dollars per share)	$ (0.02)	$ 0.02	$ 0.02	$ 0.02	$ 1.46	$ 0.04	$ 0.03	$ 0.02	$ 0.03	$ 1.55	$ 0.51
Net income (loss) per share - Diluted (in dollars per share)	$ (0.02)	$ 0.02	$ 0.02	$ 0.02	$ 1.42	$ 0.04	$ 0.03	$ 0.02	$ 0.03	$ 1.51	$ 0.50

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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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