Segment Information - Summary of Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 10,555	$ 17,003	$ 18,862	$ 27,210
Operating Segments [Member] | China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,835	1,729	5,793	2,580
Operating Segments [Member] | Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,122	2,612	8,528	3,728
Operating Segments [Member] | Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,155	3,547	1,194	5,240
Operating Segments [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	836	2,461	1,751	4,586
Operating Segments [Member] | Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	118	192	254	594
Operating Segments [Member] | Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	86	73	150	340
Operating Segments [Member] | France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	84	3,486	112	6,237
Operating Segments [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	9	2,403	579	2,403
Operating Segments [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 310	$ 500	$ 501	$ 1,502