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13. Segment and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Revenues $ 30,234us-gaap_SalesRevenueNet $ 24,859us-gaap_SalesRevenueNet  
Long-lived assets 74,260us-gaap_NoncurrentAssets   69,571us-gaap_NoncurrentAssets
UNITED STATES      
Revenues 7,294us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 5,137us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		  
Long-lived assets 19,074us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		   15,875us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
TAIWAN, PROVINCE OF CHINA      
Revenues 18,341us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_TW		 14,340us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_TW		  
Long-lived assets 37,411us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_TW		   35,688us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_TW
CHINA      
Revenues 4,599us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CN		 5,382us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CN		  
Long-lived assets $ 17,775us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_CN		   $ 18,008us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_CN