Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period			$ 72,301
Balance at end of period	$ 68,397		68,397
Foreign currency translation
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	(632)	$ (491)	(471)	$ 18
Total other comprehensive (loss) income	97	151	(64)	(358)
Balance at end of period	(535)	(340)	(535)	(340)
Available-for-sale marketable securities
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	23	47	23	19
Other comprehensive (loss) income	0	(22)	0	24
Deferred income taxes	0	9	0	(9)
Total other comprehensive (loss) income	0	(13)	0	15
Balance at end of period	23	34	23	34
Total accumulated other comprehensive loss
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at end of period	$ (512)	$ (306)	$ (512)	$ (306)