Information about Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Revenue:
Total revenue	$ 20,870	$ 25,548
Long-lived assets:
Total long-lived assets	8,600		8,813
North America [Member]
Revenue:
Total revenue	19,082	20,137
Long-lived assets:
Total long-lived assets	3,541		3,663
Asia [Member]
Revenue:
Total revenue	904	4,065
Long-lived assets:
Total long-lived assets	439		447
Europe [Member]
Revenue:
Total revenue	884	1,346
Long-lived assets:
Total long-lived assets	$ 4,620		$ 4,703