Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period			$ 58,974
Balance at end of period	$ 54,885		54,885
Foreign currency translation
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	(632)	$ (1,139)	(1,568)	$ (471)
Total other comprehensive (loss) income	(111)	97	318	(64)
Balance at end of period	(1,250)	(535)	(1,250)	(535)
Available-for-sale marketable securities
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	23	9	12	23
Other comprehensive (loss) income	(5)	0	(8)	0
Deferred income taxes	0	0		0
Total other comprehensive (loss) income	(5)	0	(8)	0
Balance at end of period	4	23	4	23
Total accumulated other comprehensive loss
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at end of period	$ (1,246)	$ (512)	$ (1,246)	$ (512)