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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Summary of Unrealized gain (loss) on investment

		As at June 30, 2012 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale securities - matures within one year:
Corporate bonds		$	15,741			$	46			$	(38	)		$	15,749
			15,741				46				(38	)			15,749
Available-for-sale securities - matures after one year through three years:
Certificates of deposits			1,960				—				(1	)			1,959
Foreign government bond			583				—				(2	)			581
Corporate bonds			36,532				73				(363	)			36,242
			39,075				73				(366	)			38,782
Total		$	54,816			$	119			$	(404	)		$	54,531
		As at December 31, 2011 (Audited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale securities - matures within one year:
Corporate bonds		$	22,204			$	16			$	(115	)		$	22,105
			22,204				16				(115	)			22,105
Available-for-sale securities - matures after one year through three years:
Certificates of deposits			2,206				—				(2	)			2,204
Foreign government bond			592				—				(3	)			589
Corporate bonds			45,024				84				(979	)			44,129
			47,822				84				(984	)			46,922
Total		$	70,026			$	100			$	(1,099	)		$	69,027

Summary of gross unrealized losses and fair values on investments

		Less than 12 months								12 months or greater
		Fair Value				Gross unrealized loss				Fair Value				Gross unrealized loss
As of June 30, 2012		$	22,002			$	(219	)		$	9,443			$	(185	)
As of December 31, 2011		$	48,594			$	(923	)		$	5,476			$	(176	)

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- Definition

Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.

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- Definition

Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

+ References

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