12. Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 UNITED STATES	Sep. 30, 2012 UNITED STATES	Sep. 30, 2013 UNITED STATES	Sep. 30, 2012 UNITED STATES	Dec. 31, 2013 UNITED STATES	Sep. 30, 2013 TAIWAN	Sep. 30, 2012 TAIWAN	Sep. 30, 2013 TAIWAN	Sep. 30, 2012 TAIWAN	Dec. 31, 2013 TAIWAN	Sep. 30, 2013 CHINA	Sep. 30, 2012 CHINA	Sep. 30, 2013 CHINA	Sep. 30, 2012 CHINA	Dec. 31, 2013 CHINA
Revenues	$ 20,766	$ 16,416	$ 54,680	$ 44,559		$ 3,742	$ 2,685	$ 8,364	$ 8,652		$ 7,576	$ 3,757	$ 22,616	$ 9,760		$ 9,448	$ 9,974	$ 23,700	$ 26,147
Long-lived assets	$ 28,910		$ 28,910		$ 26,307	$ 9,105		$ 9,105		$ 9,009	$ 4,860		$ 4,860		$ 3,738	$ 14,945		$ 14,945		$ 13,560