Segment Information - Summary of Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 14,469	$ 10,555	$ 28,737	$ 18,862
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	7,420	4,835	13,870	5,793
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,269	1,155	6,033	1,194
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,153	9	4,049	579
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,590	836	2,960	1,751
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	390	118	686	254
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	157	86	425	150
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	145	3,122	145	8,528
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	0	84	12	112
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 345	$ 310	$ 557	$ 501