12. Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Revenue and asset information by geographic region

	Three months ended June 30,				Six months ended June 30,
	2014		2013		2014		2013
Revenues:
United States	$	6,987	$	2,221	$	12,124	$	4,622
Taiwan		20,549		9,104		34,889		15,039
China		5,114		8,272		10,496		14,253
	$	32,650	$	19,597	$	57,509	$	33,914

	As of the period ended
	June 30,		December 31,
	2014		2013
Long-lived assets:
United States	$	13,640	$	9,415
Taiwan		16,632		7,192
China		16,159		16,337
	$	46,431	$	32,944