Revenues Based on Customer Location (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 50,808		$ 48,900		$ 53,677
United States
Segment Reporting Information [Line Items]
Total revenues	11,671		6,067		11,389
Europe and Middle East
Segment Reporting Information [Line Items]
Total revenues	5,655		13,384		13,695
Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	33,482		29,449		28,593
Germany
Segment Reporting Information [Line Items]
Total revenues		[1]	5,543		6,840
China
Segment Reporting Information [Line Items]
Total revenues	20,568		20,472		15,919
Japan
Segment Reporting Information [Line Items]
Total revenues		[1]		[1]	$ 7,744

[1] *) Less than 10%