Short-term Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Amortized Cost	$ 2,003
Gross Unrealized Gains	27
Gross Unrealized Losses	(13)
Fair Value	2,017
Corporate Debt Securities [Member]
Amortized Cost	1,525
Gross Unrealized Gains	20
Gross Unrealized Losses	(12)
Fair Value	1,533
Municipal Bonds [Member]
Amortized Cost	478
Gross Unrealized Gains	7
Gross Unrealized Losses	(1)
Fair Value	$ 484

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References+ Details

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

+ References+ Details

- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

+ References+ Details