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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 27,721	$ 17,835	$ 20,058
Other comprehensive income (loss), net of tax
Foreign currency translation	(71)	7	64
Change in fair value of marketable securities	65	(175)	(245)
Adjustment for net losses (gains) realized and included in net income	11	65	(316)
Total change in unrealized gains (losses) on marketable securities	76	(110)	(561)
Other comprehensive income (loss)	5	(103)	(497)
Comprehensive income	$ 27,726	$ 17,732	$ 19,561

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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