CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,152,000	$ 2,401,000	$ 7,933,000	$ 4,817,000
Other comprehensive income, net of tax:
Foreign currency translation	22,000	28,000	115,000	(66,000)
Net unrealized gain on available-for-sale securities	205,000		205,000
Comprehensive income	$ 3,379,000	$ 2,429,000	$ 8,253,000	$ 4,751,000