Description of Business and Summary of Significant Accounting Policies (Long-lived assets by geographic location) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 36,441	$ 28,741	$ 20,910
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	24,239	17,614	10,865
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	6,340	5,916	4,786
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 5,862	$ 5,211	$ 5,259