Segment Information - Summary of Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 11,115	$ 19,942	$ 29,977	$ 47,152
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,775	921	9,569	3,501
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,347	417	4,541	5,657
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,840	4,702	10,368	8,430
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,628	4,256	3,379	8,842
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	183	29	198	545
Ireland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	137	42	319	247
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	85	94	339	689
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		2,245	112	8,482
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		6,929	579	9,332
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 120	$ 307	$ 573	$ 1,427