Balance Sheet Account Details (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Available-for-sale securities:
Fair Value	$ 10,620
Gross Unrealized Losses	(9)
Commercial paper [Member]
Available-for-sale securities:
Fair Value	1,999
Gross Unrealized Losses	(1)
Corporate notes and bonds [Member]
Available-for-sale securities:
Fair Value	8,621
Gross Unrealized Losses	$ (8)