Revenues Based on Customer Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 13,674		$ 12,116
United States
Segment Reporting Information [Line Items]
Total revenues	5,167		1,653
Europe and Middle East
Segment Reporting Information [Line Items]
Total revenues	1,838		4,024
Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	6,669		6,439
Germany
Segment Reporting Information [Line Items]
Total revenues		[1]	1,684
China
Segment Reporting Information [Line Items]
Total revenues	2,713		4,018
Taiwan
Segment Reporting Information [Line Items]
Total revenues	3,088			[1]
Japan
Segment Reporting Information [Line Items]
Total revenues		[1]	$ 1,367

[1] *) Less than 10%