Information about Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Total revenue:
Total revenue	$ 25,485	$ 24,029	$ 75,538	$ 73,459
Long-lived assets:
Total long-lived assets	8,361		8,361		9,464
North America [Member]
Total revenue:
Total revenue	16,382	19,197	52,145	56,900
Long-lived assets:
Total long-lived assets	3,340		3,340		4,334
Asia [Member]
Total revenue:
Total revenue	7,733	3,449	18,951	13,499
Long-lived assets:
Total long-lived assets	230		230		111
Europe [Member]
Total revenue:
Total revenue	1,365	1,348	4,409	2,981
Long-lived assets:
Total long-lived assets	4,791		4,791		5,019
Other foreign [Member]
Total revenue:
Total revenue	$ 5	$ 35	$ 33	$ 79